JPH0895110A - Inspection device for diaphragm switching mechanism - Google Patents

Abstract

PURPOSE: To provide a diaphragm inspection device by which the assembly and the operation state of the diaphragm plate of a camera or a film unit with a lens are easily inspected from the outside, whose cost is low and whose structure is simple. CONSTITUTION: This inspection device 21 for a diaphragm switching mechanism is constituted of an actuator 23 driven by a driver 22 and mechanically operating a diaphragm switching lever 11, a sensor unit 26 having an irradiation part 24 radiating converged infrared rays and a photodetector part 25 receiving reflected light being the infrared rays reflected in a lens barrel, a range-finding circuit 27 calculating a distance between the sensor unit 26 and a part where the infrared rays are reflected based on the reflected light received by the photodetector part 25, and a controller 28 controlling the above and outputting an abnormality signal as necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device of an aperture switching mechanism for easily inspecting the operating state of the aperture of a camera or a film unit with a lens from the outside.

[0002]

2. Description of the Related Art A diaphragm switch in which a diaphragm plate having a small diameter aperture opening is inserted into and removed from a camera or a lens barrel for holding a photographing lens of a film unit with a lens, thereby changing the aperture diameter in two steps, is possible. The mechanism is much simpler in structure than the iris diaphragm (iris diaphragm) mechanism that continuously changes the diaphragm diameter by combining multiple diaphragm blades, and because it can be manufactured at low cost, a low-cost type compact camera, It is used as a diaphragm switching mechanism for film units with lenses.

[0003]

Since such a diaphragm switching mechanism has a structure in which a diaphragm plate having a small-diameter diaphragm opening is mechanically inserted into and removed from the lens barrel, the diaphragm plate may be damaged due to defective parts or improper assembly. May malfunction. However, conventionally, whether or not the diaphragm plate of the camera or the film unit with lens after the assembly is normally operated is
It is very difficult to visually inspect and confirm from the outside,
Moreover, the inspection efficiency was very poor.

The present invention has been made in view of the above problems, and has a low-cost and simple structure in which the assembling and operating states of a camera and a diaphragm plate of a lens-fitted film unit can be easily inspected from the outside. It is an object of the present invention to provide an inspection device for a diaphragm switching mechanism.

[0005]

In order to solve the above problems, the inspection light is applied to the surface of the diaphragm plate when the diaphragm plate is properly inserted, and this inspection light is reflected by the surface of the diaphragm plate. Whether the diaphragm plate is inserted or removed is detected by photoelectrically detecting whether the diaphragm plate is reflected or reflected by the surface of the shutter blade. Further, according to the present invention, in the inspection device of the diaphragm switching mechanism, when the diaphragm plate is properly inserted, a projector that irradiates the inspection light to a certain position reflected on the surface of the diaphragm plate and the proper insertion. Receiving light that is arranged at a certain distance in front of the surface of the diaphragm plate and discriminates the inspection light reflected from the surface of the diaphragm plate and the inspection light reflected from the surface of the shutter blades by the distance difference between the reflection positions. It is equipped with a vessel.

[0006]

[Function] The change of reflected light is detected before and after inserting / removing the diaphragm plate into / from the lens barrel by illuminating the inside of the lens barrel from the outside of the object to be inspected with a simple structure. It will be possible to reliably inspect the installation state of the diaphragm plate.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a telephoto type lens-fitted film unit provided with a diaphragm plate that can be inserted and removed in a lens barrel will be taken up. FIG. 2 is an external perspective view showing an example of a film unit with a telephoto lens capable of inspecting an aperture plate with an inspection device for an aperture switching mechanism according to the present invention. The lens-fitted film unit 2 comprises a unit body 3 and an outer case 4 accommodating the unit body 3. Appropriate color printing is applied to the outer case 4, and precautions for photographing are printed.

The unit body 3 includes a taking lens 6, a viewfinder 7, a shutter button 8, a remaining film number display window 9,
A winding knob 10 and a diaphragm switching lever 11 are provided, and are exposed from the opening of the outer case 4. The taking lens 6 is a telephoto lens which is composed of two plastic lenses and has a focal length of 100 mm. The finder 7 is composed of two finder lenses, and a colored filter is arranged between these finder lenses so as to freely come in and out.

The aperture switching lever 11 is for selecting one of the daytime shooting mode and the night view shooting mode. The daytime shooting mode is selected on the right side in the figure, and the left end of the slot 13 is to be selected. Slide operation to select the night view shooting mode. In the daytime shooting mode, which is used when the subject is in a bright state such as outdoors in the daytime, the filter 15 enters the viewfinder 7, and in conjunction therewith, the diaphragm plate 16 having the small-diameter diaphragm opening 16a is formed. It is set in front of the shutter blade 31 in the lens barrel (FIG. 3A).
reference). This restricts the large aperture stop 17 and prevents overexposure.

Further, in the night view photographing mode used when the subject is dark such as at night or indoors, the filter 15 is retracted from the viewfinder 7 and the diaphragm plate 16 is interlocked with the retracting movement of the filter 15. Evacuate from inside the lens barrel. As a result, there is no restriction on the aperture diameter, and photography is performed with the aperture opening 17 having an originally large aperture, which prevents insufficient exposure.

FIG. 1 is an explanatory diagram showing the construction of an inspection device for a diaphragm switching mechanism embodying the present invention. The inspection device 21 of the aperture switching mechanism is driven by the driver 22,
An actuator 23 for mechanically operating the aperture switching lever 11, a projector 24 for radiating converged infrared rays, and a light receiver 25 for receiving the reflected light reflected by the infrared rays are received by the sensor unit 26 and the light receiver 25. The distance measuring circuit 27 calculates the distance between the sensor unit 26 and the portion where the infrared rays are reflected based on the reflected light, and the controller 28 that controls these and outputs an abnormal signal if necessary. .

An electromagnetic cylinder is provided inside the actuator 23, and an operating arm 23a whose tip is covered with rubber comes into contact with the aperture switching lever 11 at the time of inspection, and the aperture switching lever 1 receives a signal from the driver 22.
Switch 1 between right and left. Sensor unit 2
The projector 24 provided in the unit 6 irradiates the focused infrared light having directivity toward the photographing lens 6 of the lens-fitted film unit 2. This infrared light is applied to the surface of the diaphragm plate 16 which is out of the diaphragm aperture 16a provided in the diaphragm plate 16. When the diaphragm plate 16 is not inserted into the lens barrel 32, infrared light is applied to the upper part of the shutter blade 31 behind it.

The light receiver 25 comprises a light receiving lens 25a and a light receiving element 25b. The photodetector 25 detects the angle θ at which the reflected light that has been irradiated and reflected on the surface of the diaphragm plate 16 or the shutter blade 31 enters the light receiving element 25b through the light receiving lens 25a, and sends it to the distance measuring circuit 27. . The distance measuring circuit 27 calculates the distance between the position where the infrared light is reflected and the sensor unit 26 based on the incident angle θ of the reflected light sent from the light receiver 25. And the diaphragm plate 16
Is the distance "l" when the lens is outside the lens barrel 32 (see FIG. 4).
(See (A)) or the distance “l-t” (see FIG. 4B) in which the diaphragm plate 16 is inserted into the lens barrel 32, which is sent to the controller 28. send.

The controller 28 compares the position of the actuator 23 with the distance information sent from the distance measuring circuit 27. When the actuator 23 is operated and the aperture switching lever 11 is set to the right side (daytime shooting mode), the distance information sent from the distance measuring circuit 27 is "l".
It is determined that the diaphragm mechanism of the lens-fitted film unit 2 being inspected is normal only when the distance information is "lt" when the diaphragm switching lever 11 is set to the left side (night shooting mode). To do. In other cases, for example, when the distance information is "l" when the aperture switching lever 11 is on the left side, it is determined that the aperture mechanism is defective and an abnormal signal is output.

Next, the operation of the above embodiment will be described. When the diaphragm mechanism of the lens-fitted film unit 2 is inspected by the diaphragm switching mechanism inspection device 21 of the present invention,
First, make sure that the infrared light is accurately incident on the taking lens 6,
The lens-fitted film unit 2 is set at a predetermined position of the inspection device 21 of the diaphragm switching mechanism. When the inspection device 21 of the aperture switching mechanism is operated, the actuator 23 first descends, and the tip of the operation arm 23a comes into contact with the aperture switching lever 11. Immediately after the start of inspection, the aperture switching lever 11 is on the right side.

With the aperture switching lever 11 on the right side, the controller 28 sends a measurement start signal to the sensor unit 26, and the projector 24 irradiates the photographic lens 6 with directional infrared light. The irradiated infrared light passes through the taking lens 6 and enters the lens barrel 32. At this time, if the diaphragm mechanism is normal, when the diaphragm switching lever 11 is on the right side, the diaphragm plate 1
Since 6 is outside the lens barrel 32, the incident infrared light goes straight to the shutter blade 31 without being blocked and is reflected by the surface of the shutter blade 31. Then, this reflected light again passes through the taking lens 6 and goes out of the lens barrel 32, and the light receiver 2
5 is incident at an angle of θ1.

Upon receiving the reflected light reflected by the surface of the shutter blade 31, the light receiver 25 sends the incident angle θ1 to the distance measuring circuit 27. The distance measuring circuit 27 calculates the distance between the position where the infrared light is reflected and the sensor unit 26 from this incident angle. Then, the distance information “l” when the incident infrared light is reflected by the surface of the shutter blade 31 is sent to the controller 28. When the aperture switching lever 11 is on the right side, the controller 28 performs the next stage of inspection with the aperture switching lever 11 on the left side only when the distance information is “l”. When information other than "l" is sent as the distance information, the diaphragm plate 16 or the shutter blade 31 is determined to be defective, an abnormal signal is output, and the inspection ends at this point.

If the inspection is normal when the aperture switching lever 11 is on the right side, the controller 28 causes the driver 2
2, and the diaphragm switching lever 11 is switched to the left side by the operation of the actuator 23. When the controller 28 sends a measurement start signal to the sensor unit 26 again, infrared light is emitted from the projector 24,
The light passes through the taking lens 6 and enters the lens barrel 32. At this time, if the diaphragm mechanism is normal, when the diaphragm switching lever 11 is switched to the left side, the diaphragm plate 16 is inserted into the lens barrel 32, so that the incident infrared light is irradiated onto the surface of the diaphragm plate 16 and reflected. To do. Then, this reflected light is again taken by the photographing lens 6
Goes out of the lens barrel 32 and is incident on the light receiver 25 at an angle θ2 different from that on the right side by an amount corresponding to the distance “t”.

When the incident angle θ2 of the reflected light is received from the light receiver 25, the distance measuring circuit 27 calculates the distance between the position where the infrared light is reflected and the sensor unit 26, and the incident infrared light is a diaphragm plate. Distance information "l-t" when reflected on the surface of 16
To the controller 28. When the aperture switching lever 11 is on the left side, the controller 28 displays the distance information as "l-
Only when "t", the diaphragm mechanism of the lens-fitted film unit 2 is determined to be normal. At this time, if the information of "l" is sent as the distance information, it indicates that the incident infrared light is reflected by the shutter blade 31, and the diaphragm plate 16 is not attached or the diaphragm is not attached. Since the interlocking mechanism between the switching lever 11 and the diaphragm plate 16 is defective, the controller 28 determines that the diaphragm mechanism is defective and outputs an abnormal signal.

In the above-mentioned embodiment, the telephoto type lens-fitted film unit is taken up as an example of the object to be inspected. However, in addition to this, a standard / panoramic switching type or close-up type lens having a diaphragm plate is also used. The attached film unit, the camera and the like can be inspected in exactly the same manner.

Further, in the above-described embodiment, the distance is calculated from the incident angle of the reflected light using infrared light as the distance measuring method. However, in addition to this, for example, a shutter is provided on a part of the diaphragm plate. Even if a mark having a reflectance higher than that of the blade is provided and a distance measuring method based on a difference in reflectance before and after the insertion and removal of the diaphragm plate is used, the same operation can be performed.

In the above-described embodiment, the diaphragm switching lever for inserting and removing the diaphragm plate is automatically switched by the actuator, but it goes without saying that the operator may manually switch it. Further, in the above-described embodiment, the inspection is performed after the taking lens is assembled, but of course, the inspection can be performed in the same manner even when the inspection is performed before the taking lens is assembled.

[0023]

As described above, the inspection device for the diaphragm switching mechanism of the present invention irradiates the surface of the diaphragm plate with the inspection light when the diaphragm plate is properly inserted, and this inspection light is emitted from the diaphragm plate. By detecting photoelectrically whether it is reflected on the surface or on the surface of the shutter blade, the insertion / removal state of the diaphragm plate is identified, so that it is a low-cost and simple structure, which is difficult to detect with the naked eye. It is now possible to reliably inspect the mounting condition.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an inspection device for an aperture switching mechanism according to the present invention.

FIG. 2 is a perspective view showing an outer appearance of a lens-fitted film unit that is an object to be inspected of the inspection device for the aperture switching mechanism of the present invention.

FIG. 3 is an explanatory view showing the diaphragm mechanism of FIG.

FIG. 4 is an explanatory view showing a state at the time of distance measurement by the inspection device of the diaphragm switching mechanism of the present invention.

[Explanation of symbols]

 2 Film unit with lens 3 Unit body 6 Photographing lens 11 Aperture switching lever 16 Aperture plate 23 Actuator 24 Emitter 25 Light receiver 26 Sensor unit 27 Distance measuring circuit 28 Controller

Claims (2)

[Claims] 1. An inspection device of an aperture switching mechanism that adjusts an exposure amount by inserting and removing an aperture plate having an aperture opening in front of a shutter blade that is opened and closed during photographing, when the aperture plate is properly inserted. It is possible to identify the insertion / removal state of the diaphragm plate by irradiating the surface of the diaphragm plate with the inspection light and photoelectrically detecting whether the inspection light is reflected by the surface of the diaphragm plate or the surface of the shutter blades. Inspection device for aperture switching mechanism. 2. An inspection device of an aperture switching mechanism for adjusting an exposure amount by inserting and removing an aperture plate having an aperture opening in front of a shutter blade that is opened and closed during photographing, when the aperture plate is properly inserted. In addition, the projector that irradiates the inspection light to a certain position reflected by the surface of the diaphragm plate and the front surface of the diaphragm plate that is properly inserted are arranged at a certain distance in front and are reflected from the surface of the diaphragm plate. An inspection device for a diaphragm switching mechanism, comprising: a light receiver that discriminates the inspection light and the inspection light reflected from the surface of the shutter blades by the distance difference between the reflection positions.