JP2821618B2 - Photodetector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photodetector that performs photodetection by pressing it against an arbitrary position on a detection surface.

[Summary of the Invention] The present invention relates to a photodetecting device for performing photodetection by pressing against a surface to be detected, wherein the optical element holder is automatically movable in a virtual axis direction with respect to the photodetecting body and swings about the virtual axis. The light detecting body is provided with a pressing means which is movably provided and presses the light element holder in a direction away from the light detecting body, thereby supporting the light detecting body and pushing the light element holder against the surface to be detected. When the optical element holder is displaced, the optical element holder is displaced against the pressing force of the pressing means, and the optical element holder is moved with respect to the virtual axis even if the virtual axis of the light detection main body is inclined with respect to the vertical axis of the detected surface. Since the contact surface is inclined and pressed tightly against the surface to be detected, the light detection device can be easily arranged without using nerves. In the direction of inclination of the virtual axis Position, the optical element holder can be moved in the virtual axis direction or the virtual axis tilt direction with respect to the light detection main body, and the optical element holder does not fluctuate due to the displacement of the light detection main body. Can be prevented.

[Related Art] For example, the convergence amount of a CRT is determined by pressing a light detecting device against the tube surface of a CRT and detecting the state of the amount of light from the tube surface. As shown in FIG. 6, in such a conventional photodetector, the case 30 is composed of an opaque case body 30a and a transparent glass 30b for closing the front end surface of the case body 30a. A light receiving element 31 is disposed on the tip end side of the case 30. The light receiving element 31 detects light entering through the glass 30b, and the surface of the glass 30b is configured as a contact surface 32. Then, the light detecting device 31 is arranged such that the contact surface 32 of the photodetector is exactly in contact with the tube surface 2 of the CRT, and the light receiving element 31 detects the light emission of the tube surface 2.

[Problem to be Solved by the Invention] However, the contact surface 32 of the photodetector is changed to the tube surface 2 of the CRT.
If the contact surface 32 is not arranged so that the vertical axis n of the contact surface 32 is perpendicular to the tube surface 2,
Leaning into contact. Therefore, a nerve is used to bring the contact surface 32 into close contact with the tube surface 2. Also, once the contact surface
Even if 32 comes into close contact with the tube surface 2 of the CRT, if it is displaced in the direction of the arrow in FIG. 6 due to camera shake during the detection, the position of the contact surface 32 and the light receiving element 31 will fluctuate due to this displacement, and this will cause an error. Detection.

Therefore, an object of the present invention is to provide a photodetector that can be easily arranged at a detection position without using nerves and that can prevent erroneous detection due to hand shake or the like.

[Means for Solving the Problems] To achieve the above object, a photodetector of the present invention comprises a photodetector main body and an optical element built-in having a contact surface on a plane perpendicular to a virtual axis of the photodetector main body. An optical element holder,
The optical element holder is provided so as to be movable within a predetermined range in the virtual axis direction with respect to the light detection main body and swingable about the virtual axis, and is pressed in a direction to separate the optical element holder from the light detection main body. The pressing means is provided.

[Operation] When the optical element holder is pressed against the surface to be detected while supporting the optical detection body, the optical element holder is displaced against the pressing force of the pressing means, and the virtual axis of the optical detection body is set to the surface to be detected. Even when the optical element holder is inclined with respect to the vertical axis, the optical element holder is inclined with respect to the virtual axis, and the contact surface is pressed against the surface to be detected exactly.
Also, in this pressed state, even if the light detection main body is displaced in the virtual axis direction or the virtual axis inclination direction due to hand shake or the like, the optical element holder moves in the virtual axis direction or the virtual axis inclination direction with respect to the light detection main body. It is flexible and the optical element holder does not fluctuate due to the displacement of the light detection main body.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. First
5 to 5 show an embodiment in which the present invention is applied to a convergence measuring photodetector.

FIG. 5 shows a measurement state of the convergence measuring device A. In FIG. 5, a color CRT (color cathode ray tube) 1 to be measured is built in a television receiver B, and a tube surface 2 of the color CRT 1 is exposed to the front. The signal cable 3 of the convergence measuring device A is connected to the video signal input terminal of the television receiver B, and the convergence measuring device A outputs a color signal.
An image is projected on the screen 2 of the CRT1. The convergence measuring device A has a light detecting device 5 connected by a cable 4, and performs light detection by pressing the light detecting device 5 to an arbitrary position on the tube surface 2 which is a surface to be detected.

FIG. 1 shows a cross-sectional view of the photodetector 5, and FIG.
The figure shows a front view of the light detection device 5. In FIGS. 1 and 2, the light detecting device comprises a light detecting main body 6 and an optical element holder 7 arranged on the tip side of the light detecting main body 6.

The outside of the light detection main body 6 is covered with a cylindrical case 8, and a hole 9 is formed in the center of the front end surface of the case 8. A signal processing circuit (not shown) is provided in the case 8, and an output of the signal processing circuit is sent from the cable 4. A light-receiving element described below is provided at the tip end in the case 8.
A push switch SW for driving 15 is fixed to the case 8 and arranged. The push switch SW includes a switch body 10 and a switch rod 11 protruding from the switch body 10. The switch rod 11 is movable and urged by a spring (not shown) in the extending direction, and when pressed against the force of the spring, the switch is turned on. The distal end of the switch rod 11 projects forward of the light detection main body 6 from the hole 9, and an intervening member 12 is provided between the switch rod 11 and the case 8 for the purpose of holding the switch rod 11. Have been.

The optical element holder 7 has a cylindrical shape having the same diameter as that of the light detection main body 6, and its case 13 is made up of an opaque case main body 13a and a glass 13b for closing the front end surface of the case main body 13a. An optical element chamber 14 is formed in the case 13, and a light receiving element 15 is arranged in the optical element chamber 14. The light receiving element 15 is configured to receive light that enters through the glass 13b, and to send the output to the signal processing circuit. Case body 13
The photodetection side panel 13a ₁ of a screw insertion hole 16 is formed at three positions at the central angle of 120 ° interval. Each of the three screws 17 projects outward from the screw insertion hole 16, and the tip of each screw 17 is screwed into the case 8 of the light detection main body 6. Therefore,
Assuming that the direction of the screw 17 is the virtual axis n direction of the light detection main body 6, the optical element holder 7 is configured to be movable in the virtual axis n direction within a range where the head 17 a of the screw 17 is regulated by the case 13. I have. The screw insertion hole 16 is formed to have a large diameter so as to have a clearance between the screw 17 and the screw 17. The optical element holder 7 is disposed on the virtual axis n within a range in which the screw 17 can move in the screw insertion hole 16. On the other hand, it is swingable.

On the other hand, the tip of the push switch SW of the switch rod 11 is in contact with the center of the light detecting body side 13a ₁ of the casing body 13. The optical element holder 7 is pressed in a direction away from the light detection main body 6 by the spring force of the switch rod 11, and the switch rod 11 also has a function as a pressing unit.

Protrusions are provided on the distal end face side of the case body 13a at an interval of a central angle of 120 °, and the protrusions protrude forward from the glass 13b. A rubber member 18 is provided at the distal end of each of the protrusions, and the distal end surface of the rubber member 18 is configured as a contact surface 19 that contacts the surface to be detected. Since the contact surface 19 is made of a rubber material having a large frictional resistance, it is unlikely to be displaced, and the contact surface 19 is located on a plane perpendicular to the virtual axis n of the light detection main body 6.

 Hereinafter, the operation of the above configuration will be described.

The measurer grasps the light detection main body 6 and presses the contact surface 19 against the tube surface 2 of the CRT 1. Then, as shown in FIG. 3, the optical element holder 7 is displaced with respect to the light detection main body 6 by the reaction force 3f from the tube surface 2, the switch rod 11 is pressed down, and the push switch SW is turned on. When the contact surface 19 is pressed, the optical element holder 7 moves to a position where the reaction force 3f from the tube surface 2 and the pressing force F of the switch rod 11 are balanced with respect to the light detection main body 6, so that the optical element holder Contact surface 19 of 7
Is pressed against the tube surface 2 by the pressing force F of the switch rod 11, and the axis of the optical element holder 7 is held even when the virtual axis n of the light detection main body 6 is inclined with respect to the vertical axis m of the tube surface 2. The contact surface 19 is pressed against the tube surface 2 while being inclined so as to coincide with the direction of the vertical axis m of the tube surface 2. Therefore, the light detection device 5 can be easily arranged at the detection position without using nerves.

Also, in this pressed state, the light detecting body is displaced in the direction of the virtual axis n or the inclination direction of the virtual axis n as shown by the arrow in FIG. Since the optical element holder 7 can move in the direction of the virtual axis n or the direction of inclination of the virtual axis n with respect to the optical element 6, the optical element holder 7 does not fluctuate following the vibration of the light detection main body 6. Accordingly, the contact surface 19 is pressed tightly against the tube surface 2 and the light receiving element 15 is not moved, so that no erroneous detection occurs.

FIG. 4 (a) is a diagram showing the action of the force of the switch rod 11 acting on the optical element holder 7. As shown in FIG. In FIG. 4A, the width of the optical element holder 7 is D, the point of action of the switch rod 11 is O, and the points of reaction from the tube face 2 are a, b, c.
(Not shown). Pressing force F from switch rod 11
Is the direction of the virtual axis n of the light detection main body 6, and as shown in FIG. 4 (b), the range (center angle θ) surrounded by the line Oa, the line Ob, and the line Oc (not shown). If the pressing force F acts on the inside, one of the contact surfaces 19 will not be lifted by the tube surface 2 because a compressive force acts on the line Oa or the like. Further, as shown in FIG. 4 (C), if a pressing force acts outside the range (center angle θ) surrounded by the line Oa, the line Ob, and the line Oc (not shown), for example, the tensile force is applied to the line Ob. Contact surface 19 corresponding to b to act
Rises from the tube surface 2. Therefore, as the center angle θ is increased, the stability of the optical element holder 7 is increased.
The width D of the optical element holder 7 is small, and each reaction point a, b,
It is preferable to increase the interval of c. However, each reaction point
If the interval between a, b, and c is widened, it becomes difficult to measure the vicinity of the corner of the tube surface 2 of the CRT 1. Therefore, it is preferable that the width D of the optical element holder 7 is reduced.

In the above embodiment, the case where the present invention is applied to a convergence measuring light detecting device is shown. However, the present invention can be applied to all devices that detect light by positioning and pressing a surface to be detected. Therefore, depending on the type of measurement, the present invention can be similarly applied to the case where measurement is performed using a light emitting element or a photocoupler as an optical element.

[Effects of the Invention] As described above, according to the present invention, in a photodetector that performs photodetection by pressing against a surface to be detected, the photoelement holder can be moved in the virtual axis direction with respect to the photodetector main body. In addition, since it is provided swingably on the virtual axis and provided with a pressing means for pressing the optical element holder in a direction away from the photodetection main body, it can be easily arranged at the detection position without using nerves. In addition, there is an effect that erroneous detection due to camera shake or the like can be prevented.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a sectional view of a photodetector, FIG. 2 is a front view of the photodetector, FIG.
FIG. 4 is a cross-sectional view showing a measurement state, FIGS. 4 (a) to 4 (c) are views showing the action of a force acting on the optical element holder, and FIGS.
FIG. 6 is a perspective view showing a measurement state, and FIG. 6 is a sectional view of a conventional photodetector. 2 ... tube surface (detected surface), 6 ... optical element body, 7 ... optical element holder, 11 ... pressing means, 15 ... light receiving element (optical element), 19, 32 ... contact surface, n: virtual axis.

Claims (1)

(57) [Claims] An optical element holder having a built-in optical element having a contact surface on a plane perpendicular to an imaginary axis of the light detection main body, wherein the optical element holder is attached to the light detection main body. The light detecting main body is provided with a pressing means that is movable in a predetermined range in the virtual axis direction and swingably on the virtual axis, and presses the optical element holder in a direction away from the light detecting main body. And a light detection device.