JPH04330850A - Contact type image sensor unit - Google Patents

Abstract

PURPOSE:To manufacture at a low cost a contact type image sensor unit by which the positioning of each element of the inside of a casing can be accurately and easily operated although it is compact, and whose quality is satisfactory. CONSTITUTION:An almost V-shaped groove V is formed along the longitudinal direction of a casing 2, a parallel inclined groove (a) is formed on one inclined face of the almost V-shaped groove V, and an LED array unit 3 is interfit and fixed to this inclined groove (a). A vertical groove (b) is formed on the other inclined face of the almost V-shaped groove V, and a rod lens array unit 4 is interfit and fixed to this vertical groove (b). Then, the upper edge of the almost V-shaped groove V is covered with a transparent cover body 6, a lead-through groove (c) is formed in the longitudinal direction of the casing just under the above mentioned almost V-shaped groove, and a photoelectric conversion unit 5 where a line sensor 51 is installed on a print circuit board 50 is interfit and fixed to the lead-through groove (c). And also, an opening groove (d) is formed in the longitudinal direction in which the vertical groove (b) is communicated with the lead-through groove (c), and the line sensor 51 is provided just under this opening groove (d).

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact type image sensor unit, and more particularly to a contact type image sensor unit that can be used as an image reading device such as a digital copying machine and a facsimile machine.

0002

Technical Background of the Invention A contact type image sensor unit consists of a same-magnification optical system, and compared to an image sensor unit that requires a reduction optical system, 1) It does not require precision in optical axis alignment, and 2) The optical path is significantly wider. It has the advantage of being able to be shortened to 100%, and is attracting attention for use in document reading devices such as digital copiers and facsimile machines, barcode readers, etc.

Moreover, as digital copying machines, facsimile machines, etc. become smaller and cheaper, there is a demand for further compactness and lower cost in the contact type image sensor units that are assembled into these devices.

This contact type image sensor unit has an LED array unit, a rod lens array unit, and a photoelectric conversion unit fixed inside a casing, and an opening surrounded by the casing, the LED array unit, and the rod lens array unit is made of transparent glass. It is covered by a lid made of a plate, and the light emitted by the LED is reflected by the document placed on the transparent glass plate, enters the rod lens, and is then focused on the line sensor made of a photoelectric conversion element. It has become. That is, it is necessary to optically arrange the LED array unit, rod lens array unit, photoelectric conversion unit, and transparent glass plate inside the casing.

[0005] Moreover, as the compactness of the contact image sensor unit is promoted, the space inside the casing becomes narrow and there is no play in the internal space of the casing.
Even stricter precision is now required for positioning the rod lens array unit, photoelectric conversion unit, and transparent glass plate. Furthermore, as the space inside the casing becomes narrower, it becomes difficult to position and fix these elements inside the casing.

[0006] As described above, the conventional contact type image sensor unit has a problem in that it is difficult to downsize and reduce the price due to the difficulty in positioning the elements inside the casing.

[0007]

[Object of the Invention] The present invention has been made in order to solve the problems of the above-mentioned prior art, and although it is compact, it is possible to easily position each element inside the casing with high precision, and therefore, the quality is good. It is an object of the present invention to provide a contact type image sensor unit having a structure that allows the contact type image sensor unit to be manufactured at low cost.

[0008]

SUMMARY OF THE INVENTION A contact type image sensor unit according to the present invention has a substantially V-shaped groove formed along the longitudinal direction of a casing, and an inclined groove parallel to one inclined surface of the substantially V-shaped groove. An LED array unit is fitted and fixed in the inclined groove of the lever, a vertical groove is formed in the other inclined surface of the substantially V-shaped groove, a rod lens array unit is fitted and fixed in this vertical groove, and the rod lens array unit is fitted and fixed in the vertical groove. The upper edge of the approximately V-shaped groove is covered with a transparent plate-like lid, and a through groove is formed in the longitudinal direction of the casing directly below the approximately V-shaped groove, through which a photoelectric conversion unit having a line sensor on the printed circuit board passes. It is characterized in that an open groove is formed in the longitudinal direction that fits and is fixed in the groove and communicates the vertical groove and the through groove, and a line sensor is disposed directly below the open groove.

In particular, it is possible to use a combination of an LED array unit having a plurality of convex and sparse protrusions arranged in a row on the back surface, and a casing in which escape grooves for these protrusions are formed at the bottom of the inclined groove. preferable.

[0010] Furthermore, it is preferable that cutout grooves are provided at both ends of the bottom of the through groove. Furthermore, the casing is preferably made of aluminum.

[0011]

In the close-contact image sensor unit according to the present invention, the LED array unit is positioned by the inclined groove, the rod lens array unit is positioned by the vertical groove, and the photoelectric conversion unit is positioned by the through groove. The light emitted by the LED is reflected by the document placed on the transparent plate-like lid, enters the rod lens, passes through the open groove, and is focused on the line sensor. Photoelectric conversion is performed on the line sensor according to the document, and the electrical signal obtained by the photoelectric conversion is processed by a photoelectric conversion unit and input into the main body of a digital copying machine, facsimile, etc.

0012

DETAILED DESCRIPTION OF THE INVENTION The contact type image sensor unit according to the present invention will be described in more detail below with reference to the drawings.

FIG. 1 shows an example of a contact type image sensor unit according to the present invention. This contact type image sensor unit 1 has an LED array unit 3, a rod lens array unit 4, and a photoelectric conversion unit 5 fixed inside a casing 2, and a side where the LED array unit 3 and rod lens array unit 4 are arranged. A substantially V-shaped groove V (see FIG. 2) of the casing 2 is covered with a transparent plate-like lid 6, and two side plates 7, 7 are provided at both ends of the casing 2.
is installed.

[0014] Various materials are used for the casing 2, but aluminum allows the cross-sectional shape of the molded product to be formed with high precision through extrusion processing, has excellent heat dissipation properties and electromagnetic noise shielding properties, and is also suitable for anodic oxidation treatment. This is preferable because it improves surface hardness and makes it less likely to be scratched.

Further, as shown in FIG. 3, the casing 2 has a substantially V-shaped groove V formed along its upper portion in the longitudinal direction. Moreover, a parallel inclined groove a is formed on one inclined surface p1 of this substantially V-shaped groove V, and a vertical groove b is formed on the other inclined surface p2.

On the other hand, directly below the substantially V-shaped groove V, a through groove c separated by a wall 2w is formed along the longitudinal direction of the casing 2, and between the vertical groove b and the through groove c, An opening groove d passing through the wall 2w is formed along the longitudinal direction of the casing 2.

Further, an escape groove e is formed at the bottom of the inclined groove a, and notch grooves f, f are formed along the longitudinal direction of the casing 2 at both ends of the bottom of the through groove c. and the second
As shown in the figure, the LED array unit 3 is fitted and fixed in the inclined groove a, and the rod lens array unit 4 is fitted and fixed in the vertical groove b. Further, the upper edge of the substantially V-shaped groove V is covered with a transparent plate-like lid 6, and a photoelectric conversion unit 5 having a line sensor 51 on a printed circuit board 50 is fitted and fixed in the through groove c. A line sensor 51 is arranged directly below the opening groove d.

That is, the LED array unit 3 can be easily positioned by inserting it into the inclined groove a, the rod lens array unit 4 can be easily positioned by inserting it into the vertical groove b, and the photoelectric conversion unit 5 can be easily positioned by inserting it into the through groove c. By inserting it, you can easily position it.

In this way, the LED array unit 3 is inserted into the inclined groove a, the rod lens array unit 4 is inserted into the vertical groove b, the photoelectric conversion unit 5 is inserted into the through groove c,
By covering the upper edge of the substantially V-shaped groove V with the transparent plate-like lid 6, the contact type image sensor unit 1 can be manufactured easily and with high precision.

The contact type image sensor unit 1 obtained in this way has LEDs as shown by the arrow l in FIG.
The emitted light passes through the transparent plate-shaped lid 6 and hits the document 8 that is in contact with the surface of the plate-shaped lid 6 by the platen roll 8, and the reflected light passes through the rod lens and is sent to the line sensor 51.
The image is formed on top. Note that part of the light hitting the original 9 is absorbed by the original 9, and the other part is reflected. The light reflected in a pattern according to the image of the original 9 is photoelectrically converted by the line sensor 51. The electrical signal obtained by photoelectric conversion is processed by the photoelectric conversion unit 5, and is input as a time-series signal to the main body of a digital copying machine, facsimile, etc. (not shown).

[0021] In the LED array unit 3, LED elements formed in a row on a substrate are covered with transparent semicylindrical lenses, and a transparent semicylindrical member is protruded on the substrate. A plurality of sparse protrusions 41 are formed in a row. The relief groove e formed in the casing 2 is
It has the role of letting such protrusions 41 escape. Also, align the protrusion 41... with the relief groove e and place the LED in the inclined groove a.
When array unit 3 is inserted, LED array unit 3
is placed in the correct position in the casing 2, so the relief groove e also serves as a guide for placing the LED array unit 3 in the correct position in the casing 2.

Note that the back side of the printed circuit board 50 is conductive because its end portion is subjected to a conductive treatment, and this portion is used as an electrode to form gold plating, which serves as a base for wire bonding, by an electrolytic method. For this reason, as shown in FIG. 4, an insulating layer 50a is formed on the back surface of the printed circuit board 50 by pasting an insulating tape or the like. Further, as shown in FIG. 3, notch grooves f, f are provided at both ends of the bottom of the through groove c, and both ends of the back surface of the printed circuit board 50, which is a part of the casing 2 and the photoelectric conversion unit 5, are provided. Contact with the edges is prevented so that the circuits provided on the printed circuit board 50 are not shorted.

[0023]

Effects of the Invention The contact type image sensor unit according to the present invention can be easily positioned by inserting the LED array unit into the inclined groove, and by inserting the rod lens array unit into the vertical groove. The conversion unit can be easily positioned by inserting it into the through groove. Therefore, the contact type image sensor unit has the advantage that it can be easily manufactured with high precision.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a contact type image sensor unit according to the present invention.

FIG. 2 is a cross-sectional view of the casing.

FIG. 3 is a sectional view of the contact type image sensor unit of FIG. 1.

FIG. 4 is a cross-sectional view of the printed circuit board.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Close-contact image sensor unit, 2... Casing, 3... LED array unit, 4... Rod lens array unit, 5... Photoelectric conversion unit, 6... Plate-shaped lid, 50...
Printed circuit board, 51... Line sensor, V... Approximately V-shaped groove, b...
Vertical groove a... inclined groove, c...
Penetration groove d...opening groove,
e... Relief groove f... Cut groove,
50a...Insulating layer.

Claims (5)

[Claims] 1. A substantially V-shaped groove is formed along the longitudinal direction of the casing, an inclined groove parallel to one inclined surface of the substantially V-shaped groove is formed, and an LED array unit is fitted into this inclined groove. A vertical groove is formed on the other inclined surface of the substantially V-shaped groove, a rod lens array unit is fitted and fixed to this vertical groove, and the upper edge of the substantially V-shaped groove is formed into a transparent plate shape. A through groove is formed in the longitudinal direction of the casing directly under the substantially V-shaped groove, and a photoelectric conversion unit having a line sensor on the printed circuit board is fitted and fixed in the through groove, and the vertical An open groove is formed in the longitudinal direction that communicates the groove and the through groove, and a line sensor is placed directly below this open groove, so that the light emitted by the LED is reflected by the transparent plate-like lid and reaches the rod lens. A close-contact image sensor unit characterized in that light is focused onto a line sensor after it is incident. 2. The LED array unit is protruded and has a plurality of sparse protrusions arranged in a row on the back surface, and an escape groove for these protrusions is further formed at the bottom of the inclined groove. 1. The close-contact image sensor unit according to 1. 3. The contact image sensor unit according to claim 1, wherein the back surface of the printed circuit board is covered with an insulating layer. 4. The close-contact image sensor unit according to claim 1, wherein the through-groove has a cutout groove at both ends of the bottom thereof. 5. The contact image sensor unit according to claim 1, wherein the casing is made of aluminum.