JPH052755A - Light detector fixing mechanism - Google Patents

Abstract

PURPOSE:To provide a light detector fixing mechanism in which the deviation of the position of an attaching member is not generated, at the time of fixing a light detector attaching member whose position adjustment is completed with a screw. CONSTITUTION:An attaching member 1 is inserted into an oval shape insertion port 9 provided at a substrate 2, and screws 5a and 5b are screwed through a plate-shaped member 8 between the side face of the substrate and the insertion port 9 into screw holes 4a and 4b. Then, the plate-shaped member 8 is deformed, and the attaching member 1 is pressurized and fixed. Thus, the fixing operation time of the light detector can be considerably reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing means for fixing an adjusted photodetector to a substrate.

[0002]

2. Description of the Related Art FIG. 7 shows, for example, Japanese Patent Laid-Open No. 61-230632.
It is a figure which shows the conventional photodetector fixing mechanism shown by the publication, 1 is a mounting member which fixed the photodetector 1A in the figure,
Reference numeral 2 is a base body to which the mounting member 1 is mounted, 3a and 3b are screw insertion portions (through holes) provided in the mounting member 1, 4a and 4b are screw holes provided in the base body 2, and 5a and 5b are mounting member 1 base bodies. A screw as a means for fixing to 2, a light beam 6 reflected from an information recording carrier (not shown), and a hole 7 for guiding the light beam 6 to the photodetector 1A.

Next, the operation will be described. The reflected light beam 6 reflected from the information carrier (not shown) passes through the hole 7 provided in the base 2 and reaches the photodetector 1A. Light detector 1
A is a base member 2 via a mounting member 1 for receiving the reflected light beam 6.
Mounted on. The reflected light beam 6 from the information carrier contains servo information and reproduction signal information, and the mounting position of the photodetector 1A must be adjusted in order to accurately obtain the servo signal or reproduction signal from the photodetector 1A. .. After this adjustment, the screws 5a and 5b are screwed into the screw holes 4a and 4b through the screw insertion portions 3a and 3b to fix the mounting member 1 and the base body 2.

[0004] Here, the base body 2 and ₁ the friction coefficient mu between the mounting member 1, the mounting member 1 and the screw 5a, a friction coefficient between the screw seat surface of 5b When mu _2, wherein between the mu ₁ and mu ₂ If there is the relationship of (1), the screw heads of the screws 5a and 5b are fixed to the mounting member 1 when fixing.
Since the mounting member 1 does not slide with respect to the base body 2 while being tightened while sliding on the top, the position of the photodetector 1A cannot be displaced. μ ₁ > μ ₂ (1) However, μ ₁ and μ ₂ are greatly influenced by the surface condition of the member,
Equation (1) is not always satisfied. Moreover, PP is used for the mounting member 1.
When an engineering plastic such as S (Poly Phenylene Sulfide) is used, its friction coefficient is generally low, and it can be used as a substitute for a fluorine resin.
When engineering plastics such as PPS are used, the friction coefficient value becomes even smaller, and equation (1) may not be satisfied due to the surface condition.

[0005]

Since the conventional photodetector fixing mechanism is constructed as described above, when the friction coefficient μ ₁ is smaller than μ ₂ , the mounting member 1 is fixed when the mounting member 1 is fixed. Since 1 slides with respect to the base body 2, there is a problem that the position of the photodetector 1A whose position adjustment has been completed is displaced according to the rotation of the screws 5a and 5b.

The present invention has been made in order to solve the above-mentioned problems, and when the mounting member to which the photodetector is fixed is fixed to the base body with a screw, the position of the mounting member does not shift, and An object of the present invention is to obtain a photodetector fixing mechanism that can significantly reduce the fixing work time of the detector.

[0007]

In the photodetector fixing mechanism according to the present invention, the side face of the base body has a width in which the mounting member can be inserted by a plate-shaped member integrally formed with the base body or formed as a separate member. By forming an insertion port such as an oval shape and screwing a screw to the base body through this plate-shaped member,
The plate-shaped member is deformed so that the mounting member is pressed into the insertion opening to be fixed.

[0008]

According to the present invention, since the screws are fixed through the plate-shaped member which is integrated with the base body or is formed as a separate member, when the screws are fixed, the lateral slip force is generated by the friction between the screw head and the plate-shaped member. Even if it occurs, the lateral displacement of the plate-shaped member is so small as to be negligible, so that the photodetector whose adjustment has been completed can be fixed without causing displacement. Further, since the plate-shaped member and the base body are connected symmetrically in the vertical and horizontal directions, the expansion and contraction in the vertical and horizontal directions is uniform even with respect to temperature changes after fixing the screws, and The displacement is so small that it can be ignored.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a disassembled state, FIG. 2 is a plan view showing an inserted state, and FIG. 3 is a plan view showing a fixed state. Is omitted. In the figure, reference numeral 8 denotes a plate-like member integrally provided on the side surface of the base 2 and has an insertion opening 9 of an oval shape or the like having a width into which the mounting member 1 can be inserted. Reference numerals 10a and 10b are screw insertion holes provided in the plate member 8 and are coaxial with the screw holes 4a and 4b.

Next, the operation of fixing the mounting member 1 to the base 2 will be described. The attachment member 1 is inserted into an insertion opening 9 of an oval shape or the like provided on the base body 2 to finely adjust the attachment position. After that, the screws 5a and 5b are inserted into the screw insertion holes 10a and 10
b and the screw insertion portions 3a, 3b, and screw holes 4a, 4b
The mounting member 1 is fixed by screwing into.

During the fixing operation, the mounting member 1 is adjusted while being pressed leftward in FIG. 2 in the oval shaped insertion opening 9 provided in the base 2. After the adjustment is completed, the screws 5a and 5b are inserted into the screw insertion holes 10a and 10b and screwed into the screw holes 4a and 4b to be tightened. The state shown in FIG. At this time, the screw head and the plate member 8
Although a side slip force due to friction is generated between and, the plate-shaped member 8 in the present invention is a part of the base body 2. Therefore, even if a side slip force is generated, the lateral displacement does not occur. It is so small that it can be neglected. Therefore, the lateral sliding force is not transmitted to the mounting member 1, and the mounting member 1 is fixed without displacement.

Although the photodetector 1A is fixed to the mounting member 1 in the above embodiment, the same effect can be obtained even if the photodetector 1A and the mounting member 1 are integrally formed.
Further, in the above embodiment, the screw insertion portion 3 provided on the mounting member 1
Although the through holes are shown as a and 3b, the screw insertion portions 3a and 3b
The shape of b may be any shape, for example, a notch for passing the screws 5a and 5b. Although the number of screws 5a and 5b is two in the example, it may be any number as long as it is one or more.

Next, another embodiment of the present invention will be described with reference to FIGS.
Will be described. FIG. 4 is a perspective view showing a disassembled state, and FIG.
6 is a perspective view showing a fixed state, and FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5. The same or corresponding parts as those in the above-mentioned embodiment are designated by the same reference numerals and the description thereof will be omitted. In the figure, 11
Reference numerals a and 11b are grooves provided on the side surface of the base body 2, reference numeral 12 is a plate-shaped member which is a member separate from the base body 2, and bent portions 12a and 1 are provided at both ends.
It has a U-shaped leaf spring structure having 2b. A window 13 is provided in the center of the plate member 12.

Next, the operation of fixing the mounting member 1 to which the photodetector 1A is fixed to the base 2 will be described. The bent portions 12a and 12b at both ends of the plate member 12 are directed toward the mounting member 1 so that the bent portion 1 surrounds the mounting member 1.
Grooves 11a, 11 provided on the base 2 with 2a, 12b
The plate-shaped member 1 is fixed to the base body 2 by being fitted in each of b. In this state, the insertion opening 9 is formed by the plate member 12 on the side surface of the base 2. After that, after finely adjusting the mounting position of the mounting member 1, the plate member 12 and the mounting member 1 are fixed by the screws 5a and 5b.

The state in which the screws are fixed is shown in FIGS.
Further, the fixing operation will be described with reference to FIG. As shown in FIG. 6, the bent portions 12a and 12b of the plate member 12 are fitted and fixed in the grooves 11a and 11b provided in the base 2. When the screws 5a and 5b are tightened, side slip and rotational force due to friction are generated between the screw seat surface and the plate-shaped member 12 as in the conventional example, but the plate-shaped member 12 is integrated with the base body 2. Since it is fixed, the lateral and rotational displacements are so small that it can be ignored even if sideslip or rotational force is generated. Therefore, neither sideslip nor rotational force is transmitted to the mounting member 1 and the photodetector 1A
It is fixed without coming off. Further, after the screw fixing is completed, the base member 2 is thermally deformed due to the temperature change of the plate-shaped member 12.
Even if a lateral force is applied to the plate-shaped member 12 due to relative displacement with respect to the bent portions 12a of the plate-shaped member 12,
The displacement in the lateral direction can be absorbed by 12b. Therefore, the skid force is not transmitted to the mounting member 1 and the photodetector 1
The position shift of A can be suppressed.

[0016]

As described above, according to the present invention, when the mounting member to which the photodetector is fixed is fixed to the base member with the screw, the photodetector is not displaced, and the work for fixing the photodetector is performed. The effect is that the time can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an exploded state of a photodetector fixing mechanism according to an embodiment of the present invention.

FIG. 2 is a plan view showing an inserted state of FIG.

FIG. 3 is a plan view showing a fixed state of FIG.

FIG. 4 is a perspective view showing an exploded state of a photodetector fixing mechanism according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a fixed state of FIG.

6 is a cross-sectional view taken along the line VI-VI of FIG.

FIG. 7 is a perspective view showing a disassembled state of a conventional photodetector fixing mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting member 1A Photodetector 2 Base body 3a, 3b Screw insertion part 4a, 4b Screw hole 5a, 5b Screw 6 Reflected light beam 8, 12 Plate member 9 Insertion port 10a, 10b Screw insertion hole

Claims (1)

Claim: What is claimed is: 1. Optical means for guiding a luminous flux from a light source to an information carrier, a photodetector for receiving a reflected luminous flux from the information carrier, and a photodetector mounting for fixing the photodetector. A member and a base body for mounting the photodetector mounting member, and the mounting member is formed by inserting a screw into a screw insertion portion provided in the mounting member and screwing the screw into the screw hole of the base body. In a photodetector fixing mechanism adapted to be fixed to the base, an oval having a width into which the mounting member can be inserted is formed on a side surface of the base by a plate-shaped member which is integrally molded with the base or is a separate member. Shape and the like, and inserts the screw into a screw insertion hole coaxial with the screw hole provided in the plate-shaped member and a screw insertion portion of the mounting member, and screwed into the screw hole. The plate-shaped member Photodetector securing mechanism, characterized in that the attachment member so as to fix by pressing in the insertion mouth Te.