JPH09243511A - Method and device for regulating lens focal position of automatic focusing camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for regulating the focal position of a lens which makes it possible to correct the deviation by measuring the focal position even after the lens is assembled in an automatic focusing camera. SOLUTION: The method for regulating the focal position of a lens to regulate the focal position of an automatic focusing camera 112 by using a collimator having an objective change and an eye piece charge for the camera 112 comprises the steps of detecting the lens focal position of the camera 112, obtaining the deviation of the detected lens focal position from the film surface of the camera 112 and its correcting amount by personal computer, connecting the contact pin 116 to the external input terminal 115 of the camera 112, inputting the deviation and the correcting amount to the memory incorporated in the camera 112, and registering them with the memory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens focus position detecting method and a lens focus position adjusting device for an automatic focusing camera using a photoelectric collimator as an optical measuring machine.

[0002]

2. Description of the Related Art A conventional lens focus position detecting method and lens focus position adjusting device are disclosed in Japanese Utility Model Laid-Open No. 4-30457.
No. 6,086,045. A conventional lens focus position adjusting device will be described with reference to FIG.

As shown in FIG. 4, on the base 420, the collimating lens 40 is placed on the optical axis of the lens 406 to be tested.
5, a half mirror 404, a light source 401, a mirror 407, and a mirror driving unit 408 are installed, and the half mirror 4
An objective chart 403 and a motor 402 that rotationally drives the objective chart 403 are installed between 04 and the light source 401. An eyepiece chart 411, a motor 410 for rotationally driving the eyepiece chart 411, and a detector 409 are installed above the half mirror 404.

In the configuration shown in FIG. 4, the light source 401
The light emitted from passes through the objective chart 403, passes through the half mirror 404, the collimator lens 405, the lens under test 406, and is reflected by the mirror 407.
It again passes through the lens 406 to be inspected and the collimator lens 405 and reaches the half mirror 404.
The light is refracted by 04, passes through the eye chart 411, and is incident on the detector 409.

By making the objective chart 403 and the eyepiece chart 411 have the same structure, the light passing through the eyepiece chart 411 has only a predetermined spatial frequency component, and the mirror driving section 408 causes the mirror 407 to move.
It is possible to measure the focal position of the lens 406 to be inspected by measuring the reflected light from the mirror 407 with the detector 409 while moving back and forth.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The lens focus position adjusting device disclosed in Japanese Patent No. 0457 is for detecting the focus position of a lens or a lens group. By the way, in the automatic focusing camera, a lens group having a desired focal position (normal focal position) in design is set on the basis of the film surface, and an AF operation (automatic focusing) is performed based on this lens group.

However, by design, when the focal position of the lens group after being actually incorporated in the autofocus camera does not match the film surface with respect to the lens group whose focal position is the film surface, the film surface Even if an AF operation based on a lens group that is supposed to form an image on the surface is executed, a difference occurs in the image forming performance on the film surface, and it becomes impossible to always obtain a good image.

Therefore, in order to always obtain a good image in the lens group actually installed in the autofocus camera, in order to always obtain a good image, the focal position of the installed lens group with respect to the film surface, It is desirable to find the amount of deviation from the desired focal position in design based on the film surface, and perform the AF operation of the incorporated lens group based on this amount of deviation.

However, the above-mentioned actual Kaihei 4-304 is used.
The lens focus position adjusting device disclosed in Japanese Patent Publication No. 57 includes a contact mechanism to an external input terminal unit, which is an information transmitting unit from a storage unit inside the autofocus camera, and a processing unit that processes a signal from the contact mechanism. Since it is not provided, there is a problem in that it is not possible to store the amount of deviation between the focal position of the lens measured and inspected and the film surface and the correction data to the storage unit inside the autofocus camera, and to store the correction data.

Therefore, the present invention provides a lens focus position adjusting method and a lens focus position adjusting device capable of measuring the focus position and correcting the amount of deviation even after the lens is incorporated in an autofocus camera. The purpose is to

[0011]

According to the first aspect of the present invention,
In the lens focus position adjusting method for adjusting the focus position of the autofocus camera by using a collimator having an objective chart and an eyepiece chart for the autofocus camera which is the object to be adjusted, the lens focus of the autofocus camera is adjusted by the collimator. The position is detected, the amount of deviation between the detected lens focal position and the film surface of the autofocus camera and its correction value are obtained by a calculation processing unit, and the obtained amount of deviation and its correction value are passed through a signal output mechanism unit. It is characterized in that it is connected to an external input terminal section of the autofocus camera and is input to and registered in a storage section built in the autofocus camera.

According to a second aspect of the present invention, the focus position of the autofocus camera provided with a collimator including an objective chart, an eyepiece chart and a collimator lens for detecting the focus position of the autofocus camera which is the object to be adjusted is adjusted. In a lens focus position adjusting device for an autofocus camera, a camera fixing portion that is arranged in front of the collimator and detachably fixes the autofocus camera at a predetermined position, a lens focus position detected by the collimator, and the autofocus camera. An arithmetic processing unit for calculating the amount of deviation from the film surface and its correction value, and a contact pin connectable to an external input terminal unit provided on the autofocus camera fixed on the camera fixing unit The shift amount and the correction value obtained by the processing unit are used for the automatic focusing via the external input terminal unit of the autofocus camera. It is characterized in that it has a signal output mechanism unit for input to the storage unit having a built-in camera registration.

The present invention will be described in more detail below. First, the autofocus camera is fixed to the camera fixing part. Next, the contact pin of the signal output mechanism is connected to the external input terminal of the autofocus camera to release the shutter of the autofocus camera.

Next, the collimator is operated to detect the focal position of the lens of the autofocus camera. Then, the arithmetic processing unit obtains the deviation amount and the correction value between the lens focus position detected by the collimator and the film surface of the autofocus camera, and the deviation amount and the correction value are output via the signal output mechanism unit and the external input terminal unit. To enter and register in the storage unit built into the autofocus camera.

[0015]

Embodiments of the present invention will be described below in detail.

[First Embodiment] (Structure) First, a lens focus position adjusting device of an automatic focus camera according to the first embodiment will be described with reference to FIGS. FIG. 1 is a front view of the lens focus position adjusting device according to the first embodiment, and FIG. 2 is a perspective view of the device. In FIGS. 1 and 2, reference numeral 112 denotes an autofocus camera (hereinafter referred to as “A
Also called "F camera". ). This AF camera 112
A base 125 is provided so that the optical axis of the lens to be inspected 106 mounted on the optical axis of the collimator lens 105 matches the optical axis of the collimator lens 105, and the L-shaped camera fixing portion 113 and the camera fixing portion 113 are provided on the base 125. On the other hand, the camera base 301 attached to the position where the lower portion of the AF camera 112 can be held in contact is arranged.

The camera fixing portion 113 is provided with the lens 1 to be inspected.
The hole 113a is provided at a position corresponding to the image forming position of 06.

A pair of clamp plates 302 are arranged at the front of the AF camera 112, and both clamp plates 302 are fixedly held by a pair of vertically holding plates 130.
A pair of holding plates 130 are supported by both corners of a slide plate 131 arranged on the base 125. Each of the clamp plates 302 includes a pressing rod 302a that is biased by a spirally wound spring so as to be able to advance and retract.

The slide plate 131 is mounted on a guide 304 that allows the clamp plate 302 to slide in the front-rear direction with respect to the AF camera 112. The guide 304 is arranged on the base 125, and further,
A lever 132 for sliding the clamp plate 302 in the front-rear direction with respect to the AF camera 112 is attached to the slide plate 131. For guiding the lever 132, a guide plate 133 is erected from the fixed base 125 so that the lever 132 penetrates.

On the other hand, a contact pin holder 117 for fixedly holding a contact pin 116 which constitutes a signal output mechanism portion which can be laterally connected (contacted) to the external input terminal 115 on the side surface of the AF camera 112, It is supported by a holding plate 127 erected on the fixed base 125.

A guide plate 128 is fixed to the lower end of the holding plate 127, and the guide plate 128 is slidably supported on a guide 119. The guide 119 is arranged on a fixed base 118 placed on the base 125 so that the contact pin holder 117 can move in the horizontal direction with respect to the external input terminal 115 of the AF camera 112. .

The guide plate 128 has a lever 12
0 is provided as a guide, and as a guide for this lever 120, a guide plate 1 through which this lever 120 penetrates the edge of the fixed base 118.
26 are erected.

Further, in the automatic focus inspection apparatus according to the first embodiment, the light source 101 which emits illumination light on the same optical axis as the lens 106 to be inspected, and the center which is arranged at a position to block the light from the light source 101 are used. An objective chart 103 having a grid pattern that spreads radially, a motor 102 that rotationally drives the objective chart 103 around its center, a half mirror 104 on which light transmitted through the objective chart 103 is incident,
The collimator lens 105 provided in the optical path of the light transmitted through the half mirror 104 and collimating the light into parallel light, and the mirror 10 facing the hole 113a of the camera fixing portion 113.
7. A mirror driving device 108, which is a driving device for the mirror 107, is provided.

Further, the incident light is received by the half mirror 104, and the objective chart 103 is received.
And an eyepiece chart 111 positioned at a right angle to the objective chart 103.
A motor 110 that is rotationally driven about the center of 11 and a detector 1 that detects light transmitted through the eyepiece chart 111.
09.

Further, a personal computer 12 which is an arithmetic processing unit for arithmetically processing the detection data detected by the detector 109 around the camera fixing unit 113.
1, the electrical equipment box 122 and the contact pin 116
And a cable 134 connecting the electrical component box 122 and the personal computer 121.

(Operation) Next, a method of adjusting the lens focal point position by the lens focal point position adjusting device having the above configuration will be described. Mount the AF camera 112 with the back cover 112a open to the camera stand 3
01, and the AF camera 1 is mounted on the camera fixing portion 113.
12 rear end portions are brought into close contact with each other and positioned, and the lever 132
Is manually operated to move along the guide plate 133, the clamp plate 302 is brought into contact with the front end surface of the AF camera 112, and the AF camera 112 is fixedly held.

For the external input terminal 115 of the AF camera 112 which is fixedly held, a contact pin holder 117 holding a contact pin 116 is attached to the lever 12.
The contact pin 116 is mounted by a manual operation of 0.
And the external input terminal 115 for transmitting information stored in a storage element inside the AF camera 112.

The AF camera 112 to which the contact pin 116 is connected is a personal computer 121.
Power is turned on by an output signal from the personal computer 121, and the AF signal is output by a drive signal from the personal computer 121.
The shutter 124 of the camera 112 is kept open.

In the first embodiment, it is difficult to maintain the open state of the shutter 124 of the normal AF camera 112, and it is necessary to maintain the open state of the shutter 124 without using a battery. Considering this, the open state of the shutter 124 is maintained by the drive signal from the personal computer 121.

Next, the light source 101 is turned on. The light emitted from the light source 101 passes through the objective chart 103, the half mirror 104, the collimating lens 105, and the test lens 106 of the AF camera 112, and the mirror driving device 1
It is reflected by the mirror 107 driven by 08,
The light again passes through the same optical path and enters the half mirror 104.

The light incident on the half mirror 104 is refracted by the half mirror 104, passes through the eyepiece chart 111 disposed at the same distance as the half mirror 104 and the objective chart 103, and is incident on the detector 109.

The objective chart 103 and the eyepiece chart 1
By using an equivalent 11 and rotating the objective chart 103 by the motor 102, only a specific frequency component of the incident light can be detected by the detector 109.

The mirror 107 is moved to a position before and after the focal plane of the AF camera 112. The detector 109
Converts the received light amount into an electrical output signal and transmits it to the electrical equipment box 122. After the electrical output signal is subjected to noise elimination processing and the like in the electrical equipment box 122, it is further transmitted to the personal computer 121.

In the personal computer 121, the mirror 1 is placed at a position where the lens 106 to be inspected is focused.
By taking advantage of the fact that the light input to the detector 109 becomes maximum when 07 comes, the focus position of the lens 106 to be tested is calculated and obtained. In addition, the personal computer 121
Calculates the shift amount between the obtained focus position and the normal focus position, and the data of the obtained shift amount is sent to the contact pin 1 via the cable 134, the electrical equipment box 122, and the cable 123.
16, send to the external input terminal 115, and further write to the storage unit built in the AF camera 112.

(Effect) Due to the above action, the lens 10 to be inspected
The focus position can be measured even when 6 is incorporated in the AF camera 112, and the correction value thereof can also be written in the storage unit of the AF camera.

[Second Embodiment] (Structure) FIG. 3 shows a second embodiment of the present invention. It should be noted that, in FIG. 3, those having the same functions as those in the first embodiment are designated by the same reference numerals, and
The explanation will focus on the parts that are different from.

FIG. 3 is a perspective view of the lens focus position adjusting device according to the second embodiment. In FIG. 3, reference numeral 112 is an AF camera which is an object to be adjusted. An L-shaped camera fixing portion 113 for fixing and holding the AF camera 112, which is provided so that the optical axis of the lens to be inspected 106 of the AF camera 112 and the optical axis of the collimating lens 105 can be aligned, is on a flat base 125. It is installed in. Further, on the base 125, there is provided a camera base 301 on which the lower part of the AF camera 112 is placed in contact.

The clamp plate 302 for fixing and holding the front end portion of the AF camera 112 is fixed and held by the pressing plate 130, and the pressing plate 130 is fixed to the slide plate 131. A cylinder 303 is connected to the slide plate 131 via a joint plate 313 and is also connected to a guide 304. A speed controller 305 is connected to the cylinder 303, an air tube 306 is connected to the speed controller 305, and a solenoid valve 307 is connected to the air tube 306.

The AF camera 112 fixedly held by the camera fixing portion 113 is provided with an external input terminal 115, and the contact pin 116 is arranged at a position where the external input terminal 115 can be contacted in the horizontal direction. Is
This contact pin 116 is used as the contact pin holder 11
It is fixedly held by 7. The contact pin holder 1
17 is supported by a holding plate 127, and the holding plate 127 is fixed to a guide plate 128. This guide plate 128
Are slidably supported along the guide 119.

The guide 119 is used for the AF camera 11
The fixed base 11 allows the contact pin holder 117 to move horizontally with respect to the second external input terminal 115.
8 and the fixed base 118 is placed on the base 125. Further, the rod of the cylinder 308 is connected to the guide plate 128 via a joint plate 314.

The cylinder 308 has a speed controller 309, the speed controller 309 has an air tube 310, and the air tube 310 has a solenoid valve 3.
11 is attached. The solenoid valves 307 and 31
1 is connected to the electrical equipment box 122, and a push button switch 312 is connected to the electrical equipment box 122. The electrical box 122 and the personal computer 121 are connected by a cable 134.

(Operation) A lens focal point position adjusting method by the lens focal point position adjusting device having the above construction will be described below.

By mounting the AF camera 112 on the camera base 301 and pressing the push button switch 312 connected to the electrical equipment box 122, the solenoid valves 307 and 3 are connected.
11 is activated and cylinders 303 and 308 are activated.
The cylinders 303 and 308 are the cylinders 30
Slide plate 13 arranged on guides 304, 119 via joint plates 313, 314 connected to 3, 308
1. The guide plate 128 is moved to hold the holding plate 1 and the holding plate 130 connected to the slide plate 131 and the guide plate 128.
27 is operated.

When the holding plate 130 is operated, the clamp plate 302 is operated to press the front end portion of the AF camera 112. Further, when the holding plate 127 operates, the contact pin holder 117 held by the holding plate 127 and the contact pin 116 held by the contact holder 117 come into contact with the external input terminal 115 of the AF camera 112. . With the contact pin 116 in contact with the external input terminal 115, it is possible to write the data of the same shift amount from the personal computer 121 as in the first embodiment into the storage unit of the AF camera 112. Other adjustment methods are the same as those in the first embodiment.

(Effect) With the above operation, the first embodiment
In addition to the above effect, the worker can automatically adjust the focus position of the AF camera 112 simply by setting the AF camera 112, which can save manpower.

[0046]

According to the first aspect of the present invention, the focus position of the lens can be measured and the deviation amount between the lens and the film surface can be corrected even after the lens is incorporated in the autofocus camera. It is possible to provide a method for adjusting the lens focal point position.

According to the second aspect of the present invention, even after the lens is incorporated in the autofocus camera, the focal position of the lens is measured and the deviation amount between the focal position of the lens and the film surface is corrected. It is possible to provide a lens focus position adjusting device capable of performing the above.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a lens focus position adjusting device according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a lens focus position adjusting device according to the first embodiment of the present invention.

FIG. 3 is a schematic perspective view showing a lens focus position adjusting device according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a conventional lens focus position adjusting device.

[Explanation of symbols]

 101 light source 102 motor 103 objective chart 104 half mirror 105 collimating lens 106 lens under test 107 mirror 108 mirror driving device 109 detector 110 motor 111 eyepiece chart 112 AF camera 113 camera fixing part 115 external input terminal 116 contact pin 117 contact pin holder 118 Fixed base 119 Guide 120 Lever 121 Personal computer 124 Shutter 125 Base 126 Guide plate 127 Holding plate 128 Guide plate 130 Holding plate 131 Sliding plate 132 Lever 133 Guide plate 301 Camera base 302 Clamp plate 304 Guide

Claims (2)

[Claims] 1. A lens focus position adjusting method for adjusting the focus position of the autofocus camera by using a collimator having an objective chart and an eyepiece chart for the autofocus camera which is an object to be adjusted. The lens focus position of the focus camera is detected, and the deviation amount between the detected lens focus position and the film surface of the autofocus camera and its correction value are obtained by an arithmetic processing unit, and the obtained deviation amount and its correction value are output as a signal. A lens focus position adjusting device for an autofocus camera, comprising: connecting to an external input terminal section of the autofocus camera via a mechanical section and inputting and registering to a storage section built in the autofocus camera. 2. A lens focus of an autofocus camera which adjusts the focus position of an autofocus camera including an objective chart for detecting the focus position of an autofocus camera which is an object to be adjusted, an eyepiece chart and a collimator including a collimating lens. In the position adjusting device, a camera fixing portion that is arranged in front of the collimator and detachably fixes the autofocus camera at a predetermined position, and a deviation amount between a lens focus position detected by the collimator and a film surface of the autofocus camera. And a calculation processing unit for calculating the correction value, and a contact pin connectable to an external input terminal unit provided on the autofocus camera fixed on the camera fixing unit, The amount of deviation and its correction value are stored in the autofocus camera via the external input terminal of the autofocus camera. A lens focus position adjusting device for an autofocus camera, comprising: a signal output mechanism section for inputting and registering into a storage section.