JPH08555U - Transmissive optical encoder - Google Patents

Abstract

(57) [Summary] [Structure] The fixing member for fixing the light emitting element has pedestal portions on both side portions, and the receiving groove portion has guide grooves for inserting an adjusting member for adjusting the amount of light received by the light receiving element. Optical encoder having a. [Advantage] Since the adjusting member can be inserted along the guide portion, the adjusting member can be easily inserted into the fixing member, so that automatic assembling becomes possible and the number of assembling steps can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmissive optical encoder having an adjusting member that is inserted in the optical paths of a light emitting element and a light receiving element to adjust the amount of light received by the light receiving element.

[0002]

[Prior art]

FIG. 9 is a sectional view of a sensor section of a conventional example of this type of transmission type optical encoder, and FIG. 10 is a perspective view of the sensor section of FIG. In the sensor section of this transmissive optical encoder, light emitted from a light emitting diode (hereinafter, referred to as LED) 2 fixed to a fixing member 1 is converted into parallel light by a collimator lens 7, and a slit 8 of a rotating disk 8 is formed. By passing through _a and the fixed slit 3 and hitting a photodiode group divided into four in a square shape provided on the fixed side element 4, a detection signal proportional to the rotation speed of the rotating disk 8 is obtained. Is configured. The fixed element 4 is installed on the sub-board 5, and the sub-board 5 and the fixing member 1 are installed on the base 9, respectively. A spacer 10 is attached between the fixed element 4 and the fixed slit 3. In this transmissive optical encoder, the magnitude of the detection signal output by each photodiode differs due to the deflection of the optical axis of LED2 or the variation in the sensitivity of the photodiode group, so that the optical path between LED2 and each photodiode is different. The four adjusting screws 6 _{1 to} 6 ₄ are inserted from the both side surfaces of the fixing member 1 two by two. By rotating these adjusting screws 6 _{1 to} 6 ₄ , the amount of light impinging on each photodiode is adjusted, and the variation in the magnitude of each detection signal is adjusted.

[0003]

[Problems to be solved by the device]

The above-described conventional transmission type optical encoder has a diameter of 0..0 to adjust the variation in the magnitude of each detection signal of the photodiode group provided in the fixed-side element 4. Since very small adjustment screws 6 _{1 to} 6 ₄ of ₅ to 1.5 mm must be inserted on both sides of the fixing member 1, high precision is required when assembling this transmissive optical encoder by a machine. There is a drawback that is done. An object of the present invention is to provide a transmissive optical encoder that can be easily assembled automatically.

[0004]

[Means for Solving the Problems]

 In the transmissive optical encoder of the present invention, the pedestals are provided on both sides of the fixing member to which the light emitting element is fixed, and the guides of the adjusting member are provided on the pedestals.

[0005]

[Action]

 Since the adjusting member is guided by the guide portion provided on the pedestal and inserted from the side surface of the fixed member, the adjusting member can be easily inserted.

[0006]

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a sectional view of a sensor unit in a first embodiment of a transmission type optical encoder of the present invention, FIG. 2 is a front view of a fixing member 11 of FIG. 1, and FIG. 3 is a perspective view of the sensor unit of FIG. The sensor part of this embodiment is different from the sensor part of the conventional example shown in FIG. 9 in that both side surfaces of the fixing member 11 guide the adjusting screws 6 ₁ , 6 ₄ and the adjusting screws 6 ₂ , 6 ₃ , respectively. That is, it is integrally provided so as to include _a pedestal portion _11a having two U-shaped grooves 11b. In this embodiment, the operation of obtaining the detection signal proportional to the rotation speed of the rotating disk 8 by receiving the light emitted from the LED 2 by the photodiode group provided in the fixed-side element 4 is the same as the conventional example shown in FIG. Is the same. However, in this embodiment, the adjusting screws 6 _{1 to} 6 ₄ are guided by the U-shaped groove 11 _b to move, so that the very small adjusting screws 6 _{1 to} 6 ₄ are inserted into the screw holes of the fixing member 11. Therefore, it is not necessary to improve the precision of the assembly, and automatic assembly becomes very easy.

FIG. 4 is a front view of a fixing member 21 in the second embodiment of the transmissive optical encoder of the present invention. The present embodiment is different from the first embodiment shown in FIG. 1 in that instead of the adjusting screws 6 ₁ to 6 ₄ as an adjusting member for adjusting the amount of light received by the photodiode group provided in the fixed-side element 4. That is, the roll pins 16 _{1 to} 16 ₄ are used. By using the roll pin _161-164 and the adjustment member can be further is possible to reduce the simplified and the manufacturing cost of the transmission Optica Le encoder assembly process, also, roll pins _161-164 it Because of its elasticity, the roll pins 16 _{1 to} 16 ₄ can be prevented from moving due to vibration. Both side surfaces of the fixed member 21 in the present embodiment, the roll pin 16 _1, 16 ₄ and a roll pin 16 _2, 16 integrally to consist cradle portion 21 _a having two U-shaped groove 21 _{b of 3} to guide each Since the roll pins 16 _{1 to} 16 _{4 which} are extremely small are easily inserted into the holes of the fixing member 21, the automatic assembly becomes easy.

FIG. 5 is a sectional view of a fixing member 31 in a third embodiment of the transmission type optical encoder of the present invention, and FIG. 6 is a perspective view showing the shapes of the small plates 26 ₂ and 26 ₄ of FIG. . This embodiment is to use four platelets 26 shown in FIG. 6 in place of the adjusting screw ₆₁ through ₄ shown in FIG. 1 as the adjustment member. By using the small plate 26, the assembling process of the present transmission type optical encoder can be further simplified and the manufacturing cost can be reduced. Also in this embodiment, the two side surfaces of the fixing member 31 are provided with two guides for guiding the small plates 26 ₁ and 26 ₄ and the small plates 26 ₂ and 26 ₃ (the small plates 26 ₁ and 26 ₃ are not shown). by integrally provided to consist cradle part 31 _a having a groove, very small platelets 26 _{1-26 4} is easily inserted into the hole of the fixing member 31, automated assembly becomes easier.

FIG. 7 is a sectional view of a sensor portion in a fourth embodiment of the transmission type optical encoder of the present invention, and FIG. 8 is a perspective view of the fixed element 14 of FIG. In this embodiment, as the fixed-side element 14, the one-chip IC in which the photodiode groups A +, A−, B +, B− having a slit shape as shown in FIG. 8 and the peripheral circuit C are integrated is used. As a result, the fixed slit 3 and the spacer 10 of the first embodiment shown in FIG. 1 are not required, and the sensor unit is made compact. Further, by using this fixed-side element 14, it is possible to eliminate the need for the external adjustment resistance of the photodiode group, which has been conventionally required. Also on both sides of the fixing member 41 in the present embodiment, by providing integrally the same cradle part 11 _a and FIG. 1, the same effect as the first embodiment of FIG. 1 is obtained. Although the photodiode is used as the light receiving element in the above-described first to fourth embodiments, it may be a phototransistor or the like. Further, in the first, second and fourth embodiments, the U-shaped groove is formed in the pedestal as a guide portion for guiding the adjusting member, but a V-shaped groove or the like may be formed.

[0010]

[Effect of device]

 As described above, according to the present invention, both side surfaces of the fixing member are integrally provided so as to include the pedestal portion having the guide portion of the adjusting member, so that even a very small adjusting member can be easily inserted into the fixing member. As a result, automatic assembly is possible, and the number of assembly steps is reduced.

[Brief description of drawings]

FIG. 1 is a first of a transmission type optical encoder of the present invention.
Sectional view of the sensor unit in the embodiment

FIG. 2 is a front view of the fixing member 11 of FIG.

FIG. 3 is a perspective view of the sensor unit of FIG.

FIG. 4 is a second part of the transmission type optical encoder of the present invention.
View of the fixing member 21 in the embodiment of FIG.

FIG. 5 is a third embodiment of the transmissive optical encoder of the present invention.
View of the fixing member 31 in the embodiment of FIG.

FIG. 6 is a perspective view showing the shapes of the small plates 26 ₂ and 26 ₄ of FIG.

FIG. 7 is a fourth embodiment of the transmissive optical encoder of the present invention.
Sectional view of the sensor unit in the embodiment

8 is a perspective view of the fixed-side element 14 of FIG.

FIG. 9 is a cross-sectional view of a sensor section of a conventional example of a transmissive optical encoder.

FIG. 10 is a perspective view of the sensor unit of FIG.

[Explanation of symbols]

1, 11, 21, 31, 41 Fixing member 2 LED 3 Fixing slit 4, 14 Fixed element 5 Sub-board 6 ₁ , 6 ₂ , 6 ₃ , 6 ₄ Adjusting screw 7 Collimating lens 8 Rotating disk 8 _a slit 9 Base 10 spacer 11 _a, 21 _a, 31 _a cradle part 11 _b, 21 _b U-shaped grooves 16 _1, 16 _2, 16 _3, 16 ₄ roll pin 26 _2, 26 ₄ platelets A +, A-, B +, B- photodiode C peripheral circuit

Claims (4)

[Scope of utility model registration request] 1. A transmission type optical encoder having an adjusting member for adjusting the amount of light received by the light receiving element, which is inserted in the optical path of the light emitting element fixed to the fixing member and the light receiving element, wherein the light emitting element is fixed. A transmissive optical encoder, wherein both side surfaces of the fixing member are pedestals having guide grooves of the adjusting member. 2. The transmissive optical encoder according to claim 1, wherein the adjusting member is a screw. 3. The adjusting member is a roll pin.
The transmissive optical encoder described. 4. The transmissive optical encoder according to claim 1, wherein the adjusting member is a small plate.