JPH01257940A - Enlarging magnification setting device for projecting device - Google Patents

Abstract

PURPOSE:To surely hold specified setting in a holding mechanism and to automatically and continuously changing magnification at the time of releasing the holding mechanism by providing a moving plate possessing a variable magnification driving ring and a click projecting part. CONSTITUTION:In order to previously set driving by the variable magnification driving ring 17 in a desired set magnification, an indicating index 41 formed on the moving plate 40 is made to conform to the desirable position of a scale 38 and a fixed screw 42 is tightened, so that the moving plate 40 is fixed on a pressing ring 18 through a holding plate 43. When a zoom driving gear 17c formed on the variable magnification driving ring 17 is manually rotated, front lens group 11 and rear lens group 12 are driven in terms of variable magnification. Since the ball 34 of the click projecting part 31 moved to the pressing ring 18 with the driving in terms of variable magnification, the ball 34 is engaged with a click recess part 45 and then what is called click action is performed. Thus, the enlarging magnification can be continuously specified with in the range of the scale 38.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a variable magnification lens mrI4 used in a projection device.
The present invention relates to an enlargement magnification setting device for a projection device that is convenient for manually or automatically setting the projection magnification in a projection device.

[Prior Art] As an example of a projection device, there is a microfilm reader printer whose schematic configuration is shown in FIG. That is, in the main body 100, a variable magnification projection lens barrel 2 is arranged in front of the optical path of the microfilm l, which is arranged in front of the optical path of the illumination light 0 from a light source (not shown). The light beam exiting the variable magnification projection lens barrel 2 is bent at a right angle by the first mirror 3 and guided to the movable mirror 4. This movable mirror 4 is held at an angle of approximately 45 degrees as shown by the solid line in FIG.
As shown by the dotted chain line, it is movable between two states in which it is held approximately horizontally.

Therefore, during reading, the light beam reflected by the first mirror 3 is bent upward by the movable mirror 4, and is enlarged and projected onto the surface of the observation screen 6 formed on the front surface of the main body 100 by the second mirror 5.

On the other hand, when printing, the movable mirror 4 is held substantially horizontally, so the light beam reflected by the fil mirror 3 travels straight and enters the third mirror 7, and after being reflected by the third mirror 7, the electrophotographic recording device A predetermined enlarged image is scanned and exposed on the surface of the photosensitive drum 8 using a scanning means (not shown).

In such a projection device such as a microfilm reader printer, in order to set its magnification, in other words, to set the variable magnification of the variable magnification lens, it is necessary to use the variable magnification projection lens mirror 1i42 while viewing the image on the observation screen 6. A zoom ring provided on the observation screen 6 is automatically driven via a gear mechanism, and the drive is stopped when the magnification of the observation screen 6 reaches a desired value, thereby obtaining an image at a predetermined magnification. .

Further, as another means for setting the magnification, it can also be done by manually directly rotating the variable magnification driving ring of the variable magnification projection lens barrel 2 described above.

[Problem to be solved by the invention] However, although the magnification setting device in such a conventional projection device allows the magnification to be set manually or automatically, the determination of the magnification does not actually affect the viewing screen. Since it was done while observing the
It does not have a structure that allows the observer to set the magnification to any desired magnification, for example, 10 times.

For this reason, it is difficult to reproduce the magnification at a later date, for example, at a later date, in the same way as previously copied using microfilm, and this meets the need to store materials using hard copies with a unified magnification. I can't do anything.

In order to solve this problem, a click mechanism is provided in the variable magnification drive ring of the variable magnification projection lens barrel, and the click engagement and holding steps of this click mechanism are adjusted to 20 times, 25 times, 30 times, etc.
It would be fine if it were possible to maintain stepwise changes in magnification such as ..., but doing so would make it difficult to change the magnification immediately before or after maintaining click engagement, or change the magnification between adjacent clicks. The above-mentioned problem cannot be solved because the retention becomes unstable.

Therefore, the present invention was made in view of the above circumstances, and it is possible to easily specify the magnification of the variable power projection lens of the projection device to a predetermined value, and to maintain the specified setting. An object of the present invention is to provide an enlargement magnification setting device for a projection device that can be reliably held by a mechanism and can automatically and continuously change the magnification by driving from the main body side when the holding mechanism is released. .

[Means for Solving the Problems] An enlargement magnification changing device in a projection device according to the present invention has the following features:
In a variable magnification projection lens barrel for forming an enlarged image in a projection device, a click convex portion or a concave portion formed on the circumferential surface of a variable magnification driving ring provided in the variable magnification projection lens barrel;
an index ring that does not rotate with respect to the rotational drive of the variable power drive ring;
A guide groove is drilled in the outer circumferential direction of the index ring over a predetermined angle range, and a magnification range formed along the guide groove corresponds to the variable power driving range of the variable power projection lens barrel. an enlarged magnification scale forming section formed at predetermined intervals;
or a first display section consisting of a base point indicator forming section for instructing the magnification magnification; A movement having a second display section on which a base point index or an enlargement scale index ring is formed opposite to the base point index forming section, and a click concave portion or a click convex portion that engages with the click convex portion or the click concave portion. It is an enlargement magnification setting device comprising a plate.

[Function] It is possible to easily specify the magnification of the zoom lens continuously to a desired value using the holding mechanism, and it is possible to reliably maintain the specified magnification setting. The present invention can be used as an enlargement magnification setting device in a projection apparatus that can automatically and continuously change the magnification by driving from the main body side when the holding mechanism is released.

[Example] Hereinafter, an example of the magnification setting device in the projection apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 5. This embodiment is an example in which the present invention is applied to a microfilm reader printer, and a zoom lens is used as a variable magnification lens for obtaining an enlarged image in a projection device. That is, FIG. 1 is a sectional view showing only the upper half of a zoom lens barrel 10 for obtaining an enlarged image in a projection device, and FIG. 2 is a perspective view showing the appearance of the zoom lens barrel 10. . The optical system of the zoom lens barrel lO is formed of two groups, a front group lens 11 and a rear group lens 12, and the zoom drive or both lenses 11 and 12 are controlled to provide light in response to predetermined zoom movement cams. This is performed by moving the lenses 11 and 12 in a complex manner in the axial direction, and the focus drive is performed by simultaneously moving both lenses 11 and 12 in the optical axis direction.

The rear part of the zoom lens barrel lO is a cylindrical fixed ring 13, and a focus drive helicoid 14 is formed on the front inner surface of this fixed ring 13. Ring 15 is engaged. Further, a rectilinear movable ring 16 is engaged with the rear inner surface of the focus drive ring 15 by a holding means (not shown).

Further, the linear movable ring 16 is prevented from rotating with respect to the above-mentioned fixed ring 13 by a means not shown in the drawings, and is only allowed to move in the optical axis direction. A presser ring 1 is attached to the tip end surface of the linearly movable ring 16, which is freely supported.
It is screwed in through the 8-wave washer 19 and moves straight through the ring 1.
A variable power drive ring 17 is rotatable on the outer periphery of the ring 6, and a light beam is formed between the rear end surface 18a of the presser ring 18 and the positioning surface 16a formed in the shape of a flange near the rear of the linear movable ring 16. It is formed so that it cannot move in the axial direction.

Further, on the circumferential surface of the variable power drive ring 17, there are two zoom cam grooves 17a, 17 having curved shapes corresponding to respective predetermined zoom movement curves of the front group lens 11 and the rear group lens 12.
b is bored, and these zoom cam grooves 17a, 17
A zoom pin 20 as a cam follower in each of b.
The outer end side of the zoom pin 20.21 is engaged with the intermediate portion of the zoom pin 20.21, and the intermediate portion of the zoom pin 20.
b, and furthermore, the proximal end side of this zoom pin 20 is
The front group lens 11 is fixed to the outer circumferential surface of a lens holding ring 22 that supports it, and the base end side of the zoom pin 21 is fixed to the outer circumferential surface of a lens holding ring 23 that supports the rear group lens 12.

A flange-shaped focus drive gear 15a is formed at the tip of the focus drive ring 15, and the output gear 24a of the focus drive drive source 24 meshes with the tooth surface of the focus drive gear 15a. A flange-shaped zoom drive gear 1 is provided at the tip of the variable power drive ring 17 described above.
7c is formed, and the output gear 25a of the zoom drive drive source 25 meshes with the tooth surface of the zoom drive gear 17c.

Holding ring 1 of the zoom lens barrel lO configured in this way
A magnification setting device 30, which is a feature of the present invention, is provided at the formation site 8. This magnification setting device 30 is formed on the circumferential surface of the variable power drive ring 17 provided in the zoom lens barrel lO, as its appearance is shown in FIG. 2 and the cross section of the main part is shown in FIG. A ric convex portion 31 is also formed. This click protrusion 31 is formed as follows. That is, a through hole 33 is formed in the vicinity of the base of the zoom drive gear 17C of the variable power drive ring 17.
The shape has a small diameter cross section 33a on the front side for preventing the ball 34 from being pulled out, which will be described later, a ball holding hole 33b with a circular cross section in the middle, and a ball holding hole 33b with a larger diameter than the ball holding hole 33b on the rear side. A female part 33c is formed.

A ball 34 is inserted into the through hole 33 via a compression spring 35 into the ball holding hole 33b, and the ball 34 can be removed by screwing a fixing screw 36 into the female thread 33c. While the ball 34 is stopped, the tip of the ball 34 is biased to protrude forward. Further, the protruding position of the ball 34 in the through hole 33 corresponds to the lowest magnification position (20x) of the magnification scale 32, which will be described later.

Further, the holding ring 18, which is an index term that does not rotate with respect to the rotational drive of the variable power drive ring 17, has a variable power drive ring 1 on its outer periphery.
7, a guide groove 37 is bored over an angular range of about 90 degrees on a plane perpendicular to the optical axis. This guide groove 3
Magnification scale forming portions (hereinafter abbreviated as "scales") formed at predetermined intervals within the magnification range corresponding to the variable power driving range of the variable power lens barrel 10 formed along 7.
38 is formed by engraving, applying paint, attaching a seal, or the like. This eye t7138 has a magnification range of, for example, 2
An index for r20XJ, which is 0 times, and an index for r35xJ, which is 35 times, are formed at both ends thereof, and in the middle, they are formed in increments of 1 times.

Furthermore, the guide groove 3 formed in the variable power drive ring 17 described above
7, a fixing screw 42 is loosely fitted with a movable plate 40 having an indicator 41 formed at the center of one side of the square plate shape, and a male threaded portion formed at the tip of the fixing screw 42. 4
2a, as shown in FIGS. 4 and 5, a position regulating portion is formed on a plate-shaped holding plate 43 and is screwed into an internally threaded portion 43a, and is formed by bending the tip side of this holding plate 43. 43b
It is fitted into a link-shaped recess 18a formed on the inner circumferential surface of the above-mentioned presser ring 18 so as to be rotatable and slidable.

Then, by screwing the fixing screw 42 into the female threaded portion 43a of the holding plate 43, both sides of the kite groove 37 of the presser ring 18 can be sandwiched and fixed between the movable plate 40 and the holding plate 43. Further, when the fixing screw 42 is loosened, the fixing screw 42 and the retaining plate 43 are integrated and can be freely moved within the range in which the guide groove 37 is formed.

Further, below the movable plate 40, there is a crevice recess 4 for engaging the ball 34 of the crevice convex part 31 described above.
5 is formed, and the zoom drive ring 1 of the zoom lens barrel lO
7 or the lowest magnification, at the end of the movement of the moving plate 40, that is, at the position of the ball 34 of the click protrusion 31 formed corresponding to the part of the scale 38 with the lowest magnification (20X). It comes into contact with the click recess 45.

Next, the operation of the magnification setting device in the projection apparatus according to the present embodiment configured as described above will be explained.

First, when automatically driving the zoom lens barrel lO in the projection device for variable magnification, loosen the fixing screw 42 and move the movable plate 4.
0 is made free with respect to the presser ring 18. and,
When the zoom drive drive source 25 is rotationally driven in this state, the output gear 25a rotates, and along with this, the variable power drive ring 17
The zoom pin 20.21 rotates while being rotationally supported by the linear movement ring 16, the amount of movement in the optical axis direction is regulated by the zoom cam grooves 17a and 17b, and is stopped from rotating by the linear movement groove 16b. The lens holding ring 22. is moved in the optical axis direction.
23, the front group lens 11 and the rear group lens 12 are moved in accordance with a predetermined zoom curve, and the magnification is changed.

At this time, since the movable plate 40 is in a free state, it does not engage with the ball 34 forming the click protrusion 31 at all, and does not become a burden on the drive source 25 for zoom driving.

On the other hand, when driving the variable power drive ring 17 to a preset desired magnification, the indicator 4 formed on the movable plate 40
1 to the desired position on the scale 38, and tighten the fixing screw 42. Then, the movable plate 40 is fixed to the presser ring 18 via the holding plate 43.

After that, when the zoom drive gear 17c formed on the variable power drive ring 17 is manually rotated, the front lens group 11 and the rear group lens 12 are driven to change the power as in the case of the automatic drive described above, and accordingly. As the ball 34 of the click convex portion 31 moves relative to the presser ring 18, the ball 34 is engaged with the click recess 45, and a so-called click operation is performed.

In this case, if the position relative to the scale 38 specified by the indicator 41 on the movable plate 40 is changed, the magnification will be 3 scales.
You can specify a range of 8 consecutively.

On the other hand, when performing focus drive in the zoom lens barrel IO, the output gear 24a is rotated by driving the focus drive drive source 24, and the focus drive ring 15 is rotated via the focus drive gear 15a.
Due to the action of the helicoid 14, the linear moving ring 16 and variable power driving ring 17 are integrated with respect to the fixed ring 13, in other words, the front lens group 11 and the rear group lens 12 are set to a predetermined variable magnification ratio. In this state, the entire lens moves in the optical axis direction, and a desired focus state can be obtained.

Note that the magnification setting device in the projection apparatus according to the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the gist thereof.

For example, the positional relationship between the scale 38 and the indicator 41 is completely reversed, and the scale 38 is formed on the movable plate 40 having a thin strip-shaped sliding surface along the arc of the outer circumference of the presser ring 18, and The indicator 41 may be formed on the surface.

Further, the positional relationship between the click convex portion 31 and the click link concave portion 45 is completely reversed, so that the click concave portion is formed in the variable power drive ring 17 and the click convex portion is formed in the movable plate 40. Good too.

Further, the magnification setting device 30 according to the present invention is formed on the click convex portion 31 or the like or on the variable magnification drive ring 17 side,
Of course, the movable plate 40 and the like may be formed on the presser ring 18 side, or the positional relationship between these may be reversed.

[Effects of the Invention] As is clear from the above explanation, the magnification setting device for the projection device according to the present invention continuously sets the magnification of the variable magnification lens of the projection device, instead of setting it stepwise as in the past. It is possible to specify a desired value with a simple configuration and simple operation, and the specified magnification setting can be reliably held with a holding mechanism that has a simple configuration. The mechanism can be easily released, and the magnification can be changed automatically and continuously using drive from the main body.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the upper half of the zoom lens barrel used in the magnification setting device in the projection apparatus according to the present invention, FIG. 2 is a perspective view of the zoom lens barrel, and FIG. 2. FIG. 4 is a cross-sectional view showing an enlarged main part of the magnification setting device shown in FIG. 2. FIG. 4 is a cross-sectional view taken along line A-A in FIG. A cutaway view, FIG. 6 is a schematic configuration diagram showing an example of a microliter printer to which the magnification setting device in the projection device according to the present invention can be applied. 16... Straight moving ring 17... Variable power drive ring 30... Magnification setting device 31... Click protrusion 33... Through hole -338...Small diameter cross section 33b...Ball holding hole 33c...Female portion 34...Ball 37...Guide groove 40 ...Moving plate 41 ... Indication index 42 ... Fixing screw 43 ... Holding plate 45 ... Click recess Patent applicant Minolta Camera Co., Ltd.

Claims (1)

[Claims] 1. In a variable magnification lens barrel for forming an enlarged image in a projection device, a click convex portion or a concave portion formed on the circumferential surface of a variable magnification drive ring provided on the variable magnification lens barrel. an index ring that does not rotate with respect to the rotational drive of the variable power drive ring; a guide groove bored in the outer circumferential direction of the index ring over a predetermined angular range; and a guide groove formed along the guide groove. and a first display section comprising a magnification scale forming section formed at predetermined intervals within a magnification magnification range corresponding to the magnification driving range of the variable magnification lens barrel, or a base point indicator forming section for indicating the magnification magnification. and a base point index or an enlarged magnification scale index that is slidable in the guide groove and can be fixed at any position corresponding to the magnification range, and that faces the magnification scale forming section or the base point index forming section. having a second display portion in which a ring is formed;
An enlargement magnification setting device for a projection apparatus, further comprising: a moving plate having a click concave portion or a click convex portion that engages with the click convex portion or click concave portion.