JPH07288724A - Adapter for camera - Google Patents

Abstract

PURPOSE:To provide an inexpensive adapter of a camera for making possible electronic video image recording without damaging the size of a lens shutter camera. CONSTITUTION:An image forming lens 34 forms the object image of a range equivalent to the object image formed on a film surface at an image pickup element 36, the image pickup element 36 receives the object image formed by the image forming lens 34 and outputs image signals and a memory 39 stores the image signals outputted from the image pickup element 36. Then, a case body is provided with the image forming lens 34, the image pickup element 36 and the memory 39 and is freely attachable and detachable to/from a camera main body. Further, the memory 39 is freely attachable and detachable to/from the case body as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera adapter for an image pickup device such as a camera, which can switch between photographing using a silver salt film and electronic image recording.

[0002]

2. Description of the Related Art Conventionally, there has been disclosed a technique relating to an electronic still camera for converting a photographed image into an electric signal by using a photoelectric conversion element and recording the electric signal on various recording media. There has also been proposed a technique in which a camera back using a silver salt film is removed and a unit having an electronic image pickup device is attached instead to use the camera as an electronic still camera.

As an example of this, Japanese Patent Laid-Open No. 2-276375
In the publication, the body part can be freely attached and detached by selecting one of a first body part including an image pickup device, an electric circuit system and a magnetic recording device, and a second body part in which a silver salt film can be incorporated. By doing so, a technology relating to a "camera capable of selecting two recording methods" for selecting a photo recording method according to a shooting date and time is disclosed.

Further, in Japanese Patent Laid-Open No. 4-373367, a photoelectric conversion image pickup device is provided with an image pickup surface having a size substantially equal to the aperture size of a camera body using a silver salt film, so that a correction for an electronic image is made. A technique relating to an "electronic image pickup back" which does not require a photographing optical system or a correction finder optical system and can be mounted on a camera body to perform electronic photographing is disclosed.

[0005]

However, in the technique disclosed in Japanese Patent Laid-Open No. 2-276375, it is necessary to replace the silver salt film and the electronic image in body units, which is expensive. Furthermore, the above-mentioned JP-A-4-373.
In Japanese Patent No. 367, it is necessary to make the image pickup device equal to the aperture size of the silver salt film, which is very expensive.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive camera adapter capable of electronic image recording without impairing the size of the lens shutter camera. is there.

[0007]

In order to achieve the above object, the camera adapter according to the first aspect of the present invention is an adapter which is detachable from the camera body, and is equivalent to a subject image formed on a film surface. A reduction optical system for forming a subject image in the range, an image pickup element for receiving the subject image formed by the reduction optical system and outputting an image signal, and the image signal output from the image pickup element And a reduction optical system, the image pickup device, and the storage means, and a detachable housing for the camera body, and the subject image can be electrically recorded. There is.

The camera adapter according to the second aspect is an adapter which is detachable from the camera body and is arranged at a position where the subject light flux from the photographing lens is received, and has a range equivalent to the subject image formed on the film surface. A reduction optical system for forming an image of the subject image, an image pickup device for receiving the subject image formed by the reduction optical system and outputting an image signal, and the image signal output from the image pickup device. Storage means, the reduction optical system, the image pickup device, and the storage means, which is detachable from the camera body, and is provided in the housing to communicate with the control means in the camera body. Communication means, and by mounting the housing on the camera body, the subject image can be electrically recorded.

Further, the camera adapter according to the third aspect is an adapter which is attachable to and detachable from the camera body, is arranged at a position for receiving a subject light flux from a photographing lens, and has a range equivalent to a subject image formed on a film surface. A reduction optical system for forming an image of the subject image, an image pickup device for receiving the subject image formed by the reduction optical system and outputting an image signal, and the image signal output from the image pickup device. The storage means, the communication means for communicating with the control means of the camera body, and the reduction optical system and the image sensor when the photographing optical system of the camera body retracts or retracts to shorten the focal length. And a housing in which the image pickup device, the reduction optical system, the storage unit, the communication unit, and the evacuation unit are arranged. And Bei, the housing by mounting on the camera body, has an electric recordable constituting the object image.

[0010]

That is, in the camera adapter according to the first aspect of the present invention, the reduction optical system forms a subject image in the same range as the subject image formed on the film surface, and the image pickup element is the reduction optical system. The subject image formed by is received and an image signal is output, and the storage means stores the image signal output from the image pickup device. The housing is equipped with the reduction optical system, the image pickup device, and the storage means, and is detachable from the camera body.

In the camera adapter according to the second aspect, the reduction optical system is arranged at a position for receiving the subject light flux from the photographing lens and forms a subject image in the same range as the subject image formed on the film surface. Then, the image pickup device receives the subject image formed by the reduction optical system and outputs an image signal, and the storage means stores the image signal output from the image pickup device. The casing is equipped with the reduction optical system, the image pickup device, and the storage means, and is detachable from the camera body. Further, the communication means is provided in the housing and communicates with the control means in the camera body.

Further, in the camera adapter according to the third aspect, the reduction optical system is arranged at a position for receiving the subject light flux from the photographing lens and forms a subject image in the same range as the subject image formed on the film surface. Then, the image pickup device receives the subject image formed by the reduction optical system and outputs an image signal, and the storage means stores the image signal output from the image pickup device. The communication means communicates with the control means of the camera body, and the retracting means is at least one of the reduction optical system and the image pickup device when the photographing optical system of the camera body retracts or retracts to shorten the focal length. To evacuate. The image pickup device, the reduction optical system, the storage means, the communication means, and the evacuation means are arranged in the housing.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 2 shows the configuration of a camera to which the camera adapter of the present invention is attached, and the camera will be described. As shown in the figure, two groups of positive and negative zoom lenses 1 and 2, a lens shutter 3, an aperture 4, and a film 5 are arranged on the optical path of the subject light. A lens encoder 24 is connected to the zoom lens 1, and the output of the lens encoder 24 is connected to the input of the lens drive circuit 23.

A shutter control circuit 25 is connected to the lens shutter 3 and the zoom lens 2 is connected.
A zoom encoder 27 is connected to the. The output of the zoom encoder 27 is connected to the input of the zoom drive circuit 26, and the zoom drive circuit 26 is connected to the zoom lenses 1 and 2.

Further, in the observation optical system, an objective lens 6 of a real image type zoom finder, prisms 7 and 8 for vertically and horizontally reversing, and an eyepiece lens 9 are arranged on the optical path of the subject light, respectively. The subject light is guided to the photographer's eyes.

The automatic focus adjustment (AF) circuit 14 includes an infrared light emitting diode (IRED).
12, a position detection element (PSD) 13 is connected,
A light projecting lens 10 is provided on the optical path of the light projected from the IRED 12, and PS is provided on the optical path of the reflected light from the subject of the light.
A light receiving lens 11 is arranged at a position facing D13. The output of the AF circuit 14 is the feed amount calculation circuit 1
5 and Flash Matic (FM) arithmetic circuit 2
It is connected to the 0 input.

On the optical path of the subject light, a photodetector (SPD; Silicon Pho) is provided through an automatic exposure adjustment (AE) lens.
to Diode) 17 is also arranged, and the output of the SPD 17 is connected to the input of the control circuit 33 via the AE arithmetic circuit 18.

Further, the input of the control circuit 33 is, in addition to the feed amount calculation circuit 15, the release input circuit 28.
And the output of the zoom input circuit 29 are connected, and the output of the control circuit 33 is the display circuit 30 and the light emission control circuit 21,
Lens drive circuit 23, shutter control circuit 25, zoom drive circuit 26, magnetic recording circuit 31, film feeding circuit 32
Connected to each input.

The output of the DX code reading circuit 19 is connected to the inputs of the AE circuit 14 and the FM arithmetic circuit 20, and the output of the FM arithmetic circuit 20 is transmitted through the light emission control circuit 21 to the strobe light emitting circuit 2. Connected to input.

In such a structure, the subject image is formed on the film 3 through the zoom lenses 1 and 2, the lens shutter 3 and the aperture 4. At this time, aperture 4
Limits the screen size of film 3. Then, the subject light is also guided to the photographer's eyes through the objective lens 6, the prisms 7 and 8 for vertically and horizontally inverting, and the eyepiece 9 in the observation optical system.

The infrared light projected from the IRED 12 is projected onto the subject through the light projecting lens 10, and the reflected light from the subject is received by the PSD 13 through the light receiving lens 11. The AF circuit 14 uses the principle of the triangulation method based on the output of the PSD 13 to obtain the reciprocal 1 of the subject distance l.
/ L is output to the feed amount calculation circuit 15 and the FM calculation circuit 20. The extension amount calculation circuit 15 calculates the amount of extension of the lens from the reciprocal 1 / l of the subject distance and the focal length of the photographing lens.

Further, the subject light is also received by the SPD 17 via the AE lens 16, and the SPD 17 outputs a photocurrent proportional to the brightness of the subject to the AE calculation circuit 18.
The AE calculation circuit 18 determines the shutter speed from the output signal of the DX code reading circuit 19 and the output signal of the SPD 17 according to the following equation (1). Note that AV is the aperture, TV is the shutter speed, BV is the subject brightness, and SVF is the film sensitivity.

EV = AV + TV = BV + SVF (1) Then, the FM arithmetic circuit 20 calculates a proper flash emission amount when the flash is used based on the distance information based on the following expression (2). Incidentally, GV indicates a strobe light amount, DV indicates a subject distance, and AV0 indicates an open aperture.

GV + SVF = AV0 + DV (2) Further, the light emission control circuit 21 controls the light emission amount based on the strobe light amount value GV calculated by the FM arithmetic circuit 20, and the lens drive circuit 23 controls the lens for focus adjustment. The lens encoder 24 detects the lens position.

Then, the zoom drive circuit 26 drives and controls the focal length of the photographing lens, and the zoom encoder 27 outputs the focal length at any time. Furthermore, the release input circuit 28 outputs a 1st release signal when a release button (not shown) is half-pressed, and outputs a 2nd release signal to the control circuit 37 when the release button is completely pressed.

Further, the magnetic recording circuit 31 is for recording magnetic information on the magnetic recording layer provided outside the screen of the film 5, and the film feeding circuit 32 is for feeding the film 3 for winding and rewinding. Is to do.

When the camera adapter of the present invention is attached to the camera having the above configuration, the overall configuration is as shown in FIG. That is, the imaging lens 34 and the image pickup device 36 are integrally formed in the adapter portion 35 fitted to the aperture 4 of the camera. The image forming lens 34 and the image pickup device 36 are arranged so as to be positioned on the optical path of the subject light when the adapter portion 35 is fitted in the aperture 4. Then, the image pickup device 36
Is output from the preamplifier 43, the signal processing circuit 44, the A / D
Conversion circuit 45, image compression circuit 46, memory drive circuit 47
Is connected to the input of the memory 39 via.

Further, the sequence circuit 37 is mutually connected to the control circuit 33 on the camera side, and is also connected to the lens extension amount correction circuit 38 and the electronic shutter time arithmetic circuit 40. The output of the sequence circuit 37 is connected to the inputs of the memory drive circuit 47, the signal processing circuit 44, the electronic shutter timing circuit 42, and the image pickup element drive circuit 41. The outputs of the electronic shutter timing circuit 42 and the image pickup device drive circuit 41 are connected to the inputs of the image pickup device 36.

In such a structure, since the lens extension amount correction circuit 38 changes the extension amount of the lens 1 even if the object distance is the same by inserting the imaging lens 34,
The amount is calculated and output to the sequence circuit 37.

Then, the electronic shutter time arithmetic circuit 4
In the case of 0, since the entire open F number is changed by inserting the imaging lens 34, the sensitivity SVC of the image sensor 36 is taken into consideration, and the electronic shutter time when the image sensor 36 becomes appropriate based on the following equation (3). TVC is calculated and output to the control circuit 37.

AVC0 + TVC = BV + SVC (3) Further, the sequence circuit 37 controls the entire adapter of the camera and performs data communication with the control circuit 33 on the camera side. Then, the image pickup device drive circuit 41 outputs a synchronous clock of the image pickup device 36, and the electronic shutter timing circuit 42 controls the timing of the electronic shutter.

An image pickup device 36 through the image forming lens 34.
When a subject image is formed on the image pickup device 36, the signal of the image pickup device 36 is amplified by the preamplifier 43, then subjected to predetermined image signal processing by the signal processing circuit 44, and digitally processed by the A / D conversion circuit 45. Converted to a signal.

The digital signal is compressed by the image compression circuit 46 and then stored in the memory 39 via the memory drive circuit 47. The memory 39 is detachable from the camera adapter.

Here, as shown in FIG. 3, even in the case of a lens having a focal length f1, the focal length is usually changed by inserting the camera adapter. Now, assuming that the focal length of the imaging lens 34 is f2 and the distance between the principal points of the zoom lens 1 and the imaging lens 34 is Δ, the combined focal length f'is generally expressed by the following equation.

[0035]

[Equation 1]

In FIG. 3, since the focal length is approximately 1/2, the size of the image pickup element 36 is also 1/2. If the imaging lens 34 is not provided, the image sensor 36 needs to have the same size as the aperture in order to obtain a similar angle of view, which is expensive. Solving the problem.

The mechanical layout of the camera adapter of the present invention is as shown in FIG. As shown in the figure, the adapter portion 35 is connected to the exchange cover 65 by a spring 64. The camera connector 66 is connected to the camera to enable data communication. As the terminal on the camera side, a terminal conventionally provided for making various adjustments at the time of factory shipment is used. Further, reference numeral 68 indicates various integrated circuits, which also include the sequence circuit 37. Then, the memory card 48 is inserted from the rear insertion slot of the rear cover, and is connected to the memory connector 67 at the time of insertion.

Hereinafter, with reference to the flowchart of FIG.
The operation of the camera will be described. When a power switch (not shown) is operated and power is supplied to the control circuit 33 (step S1), the control circuit 33 performs a predetermined display on the display circuit 30 (step S2). Then, the zoom input circuit 2
If there is a zoom input by 9 (step S3),
The control circuit 33 operates the zoom drive circuit 26 to perform zoom control (step S4). Then, a release button (not shown) is pressed almost halfway to release the release input circuit 28.
When the 1st release signal is output from (step S
5), the control circuit 33 performs automatic focus adjustment by the AF circuit 14, and calculates the reciprocal 1 / l of the subject distance 1 using the principle of the triangulation method (steps S6 and S7).

Subsequently, the feed amount calculation circuit 15 reads the signal of the zoom encoder 27, and the signal and the above 1 / l.
The lens extension amount is calculated based on
8, S9). Then, photometry is performed, the DX code of the film cartridge is read by the DX code reading circuit 19, and the AE calculation is performed by the AE calculation circuit 18 based on these to calculate the photometric value (steps S8 to S12).

If a strobe is required (step S13), FM calculation is performed by the FM calculation circuit 20 to determine the strobe light emission amount, and then the shutter speed is determined based on the photometric value (step S13). S15 ~ S1
7). On the other hand, if you don't need a strobe,
The shutter speed is immediately determined (step S14).

In this way, when the release button (not shown) is completely pressed and the 2nd release signal is output from the release input circuit 28 to the control circuit 33 (step S18), the lens drive circuit is calculated based on the previously determined amount of extension. The lens 23 extends the lens 1, opens the lens shutter 3, and the film 5 is exposed until the timer counts up, that is, for a predetermined time. At this time, when the strobe is used, the strobe light emission circuit 22 emits the strobe light and then the lens shutter 3 is closed (steps S19 to S2).
5). Then, the lens is reset and one film 5 is wound up by the film feeding circuit 32, and then magnetic recording is performed on the magnetic recording layer of the screen of the film, and all the operations are finished (steps S26 to S28).

Next, the operation when the camera adapter is attached to the camera will be described with reference to the flowchart of FIG. When a power switch (not shown) is operated to supply power to the control circuit 33 and the sequence circuit 37 (step S101), the sequence circuit 37 on the adapter side of the camera performs data communication with the control circuit 33 on the camera side, The control circuit 33 on the camera side. The attachment of the camera adapter is recognized (step S102).

The control circuit 33 on the camera side sends the focal length information to the sequence circuit 37 on the adapter side of the camera,
The open F number information, other correction information, and zoom prohibited area information are transmitted. This zoom prohibition information is the imaging lens 3
This is information used when an unusable zoom area occurs due to mounting No. 4 (steps S103 to S10).
7). Subsequently, when there is a zoom input by the zoom input circuit 29, zoom control is performed only when it is not in the zoom prohibited area, and when it is in the zoom prohibited area, the zoom is stopped and the display circuit 30 is warned. I do. Then, if there is no zoom input, the zoom is stopped (steps S108 to S114).

Then, when a release button (not shown) is pressed approximately halfway and a 1st release signal is output from the release input circuit 28 to the control circuit 33 (step S110), the AF
The AF operation is performed by the circuit 14 (step S115),
The reciprocal 1 / l of the subject distance l is calculated (step S11
6), the signal from the zoom encoder 27 is read (step S117), and the focal length f1 is calculated (step S11).
8), photometry is performed to calculate the subject brightness BV (step S
119), the control circuit 33 uses these 1 / l, the focus value f1
, The subject brightness BV is transmitted to the sequence circuit 37 of the camera adapter (step S120).

Subsequently, on the adapter side of the camera, the lens extension amount correction circuit 38 calculates the lens extension amount based on the above 1 / l and the focal length f1 (step S).
121). Here, this calculation will be described with reference to FIG. Normally, when the lens having the focal length f1 is wholly extended to focus on an object located at the distance l, the lens extension K from the infinite position is expressed by the following equation (5).

[0046]

[Equation 2] When the vertical magnification of the zoom lens with respect to the film surface of the first lens group is β ² , the lens extension amount K is given by the following equation (6).

[0047]

[Equation 3] When the image forming lens 34 is inserted, the above equation (6) becomes the following equation (7).

[0048]

[Equation 4]

Here, f'represents the combined focal length of the above formula (4), and β ² represents the vertical magnification after combination.
In this way, the lens extension amount is corrected. Subsequently, the necessity of the strobe is determined from the subject brightness BV, and if the strobe is required, the FM operation circuit 20
Then, the FM correction calculation is executed according to, the flash emission amount is determined by the flash emission circuit 22, the electronic shutter time is determined, and the mechanical shutter time is determined. On the other hand, when the strobe is not required, the electronic shutter time is determined and the mechanical shutter time is determined. The electronic shutter time is obtained from the equation (3), and the mechanical shutter time needs to be set slightly longer than the electronic shutter time. The lens extension amount, the mechanical shutter speed, and the flash emission amount are transmitted to the camera side (steps S122 to S1).
29).

Thus, when the release button (not shown) is completely pressed and the 2nd release signal is output from the release input circuit 28 to the control circuit 33, the lens is extended,
When the mechanical shutter is opened and the information is transmitted to the camera adapter, the electronic shutter is opened, and after a predetermined time, the electronic shutter is closed. At this time, if the strobe light is required, the strobe light is emitted (step S1).
30-S140).

After a further predetermined time has elapsed (step S14)
1), the mechanical shutter is closed, the lens is reset, and all the operations are finished (steps S142, S143). The configuration and operation of the camera and the camera adapter have been described above. Next, referring to FIG. 8, a monitor device for confirming the image information stored in the memory 39 with the camera adapter actually attached is described. explain.

As shown in FIG. 8, when the memory 39 is connected to the monitor device, the digital signal is read out by the memory drive circuit 49. The compressed digital signal is decompressed (decompressed) by the image decompression circuit 50, converted into an analog signal by the D / A conversion circuit 51, and output to the monitor 53 via the monitor driving circuit 52, thus the monitor 53. The image is displayed on. At this time, the input circuit 54 instructs the number of frames and the like, and the control unit 55 controls the entire operation.

Finally, an improved example of the above-mentioned camera adapter will be described with reference to FIG. The camera adapter according to the improved example is designed to prevent damage when the lens retracts when the camera is retracted.

That is, the positioning portion 62 fitted to the aperture 4 and the moving frame 63 are fitted in the optical axis direction. An image forming lens 34 and an image pickup device 36 are arranged therein. A spring 64 is provided between the moving frame 63 and the rear cover 65 and connects them.

Therefore, from the state shown in FIG.
When the taking lens collapses to the state shown in (a), 2
Since the moving frame 63 is pushed by the frame 61 of the zoom lens 2 of the group and moves backward, it is possible to prevent the destruction of either one.

As described in detail above, according to the camera adapter of the present invention, an inexpensive camera adapter can be provided without impairing the size of the lens shutter. According to the above embodiment of the present invention, the following configurations can be obtained. (1) An image pickup device for forming a subject image, a reduction optical system for forming an image on the image pickup device in a region substantially equal to a region that can be photographed by a photographing optical system of a silver halide camera, and the image pickup device A storage unit for storing the output, a communication unit for performing data communication with the silver halide camera, a housing in which the image pickup device, the reduction optical system, the storage unit, and the communication unit are arranged. , A camera adapter capable of electrically recording a subject image by mounting the housing on the silver halide camera. (2) An image pickup device for forming an image of a subject, and an image pickup device inserted behind the image pickup optical system in order to form an image on the image pickup device, which is almost the same as the image pickup region of the silver halide camera. Reduction optical system, storage means for storing the output of the image pickup device, communication means for performing data communication with the CPU of the silver halide camera, the image pickup device, the reduction optical system,
The storage means and the communication means are arranged, and a housing configured to insert the reduction optical system from the aperture of the silver salt camera, and by mounting the housing on the silver salt camera, a subject image is captured. An electrically recordable camera adapter. (3) An image pickup device for forming a subject image, and an image pickup device which is inserted behind the image pickup optical system so as to form an image on the image pickup device which is substantially equal to a region which can be photographed by the photographing optical system of the silver halide camera. Reduction optical system, storage means for storing the output of the image pickup device, and communication means for performing data communication with the CPU of the silver halide camera, the content of which is to insert the reduction optical system. And a communication means relating to focus adjustment and exposure adjustment generated by the image pickup device, the reduction optical system, the storage means, and the communication means, and the reduction optical system is inserted from the aperture of the silver halide camera. A camera adapter capable of electrically recording a subject image by mounting the housing on the silver halide camera. (4) An image pickup device for forming a subject image, and an image pickup device inserted behind the image pickup optical system to form an image on the image pickup device which is almost the same as the image pickup region of the silver halide camera. Reduction optical system, storage means for storing the output of the image pickup device, and communication means for performing data communication with the CPU of the silver halide camera, the content of which is to insert the reduction optical system. And a communication means for changing the amount of lens extension caused by the image pickup device, the reduction optical system, the storage means, and the communication means are arranged, and the reduction optical system is inserted from the aperture of the silver halide camera. A camera adapter capable of electrically recording a subject image by mounting the housing on the silver halide camera. (5) An image pickup device for forming an image of a subject, and an image pickup device for inserting an image pickup device into the rear of the image pickup optical system so as to form an image in the image pickup device in a region substantially equal to the image pickup region of the silver halide camera. A reduction optical system, a storage means for storing the output of the image pickup device, and an input / output terminal used for adjustment of the silver salt camera at the time of factory shipment from the silver salt camera.
A communication means for performing data communication with the PU, a housing having the image pickup device, the reduction optical system, the storage means, and the communication means disposed therein, and a configuration in which the reduction optical system is inserted from the aperture of the silver halide camera. A camera adapter that has the above housing and can electrically record a subject image by mounting the housing on the silver halide camera. (6) An image pickup device for forming a subject image, and an image pickup device for inserting an image pickup device into the rear side of the image pickup optical system so as to form an image in the image pickup device in a region substantially equal to a region photographable by the image pickup optical system of the silver halide camera Reduction optical system, storage means for storing the output of the image pickup device, communication means for performing data communication with the CPU of the silver salt camera, and the photographing optical system of the silver salt camera for retracting or focal length. When retracting for shortening, the retracting means for retracting at least one of the reduction optical system and the image pickup element, the image pickup element, the reduction optical system, the storage means, the communication means, and the comparison means are provided. And a housing configured to insert the reduction optical system through the aperture of the silver salt camera, and by mounting the housing on the silver salt camera, a camera capable of electrically recording a subject image adapter.

[0057]

According to the present invention, it is possible to provide an inexpensive camera adapter capable of recording an electronic image without deteriorating the size of the lens shutter camera.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration when a camera adapter of the present invention is attached.

FIG. 2 is a diagram showing a configuration of a camera to which the camera adapter of the present invention is attached.

FIG. 3 is a diagram showing how the focal length changes when the camera adapter is attached.

FIG. 4 is a diagram showing a mechanical layout of the camera adapter of the present invention.

FIG. 5 is a flowchart showing an operation when a camera adapter is not attached to the camera.

FIG. 6 is a flowchart showing an operation when a camera adapter is attached to the camera.

FIG. 7 is a diagram for explaining the calculation of the lens extension amount based on 1 / l and the focal length f1 by the lens extension amount correction circuit.

FIG. 8 is a diagram showing a configuration of a monitor device for confirming image information stored in a memory 39 when the camera adapter is actually attached.

FIG. 9 is a diagram showing a configuration of an improved example of a camera adapter.

[Explanation of symbols]

1, 2 ... Zoom lens, 3 ... Lens shutter, 4 ... Aperture, 5 ... Film, 6 ... Objective lens, 7,8 ... Prism, 9 ... Eyepiece lens, 10 ... Projection lens, 11 ... Light receiving lens, 12 ... IRED , 13 ... PSD, 14 ... AF circuit, 15 ... Feed amount calculation circuit, 16 ... AE lens, 1
7 ... SPD, 18 ... AE arithmetic circuit, 19 ... DX code reading circuit, 20 ... FM arithmetic circuit, 21 ... Light emission control circuit, 2
2 ... Strobe light emitting circuit, 23 ... Lens driving circuit, 24 ...
Lens encoder, 25 ... Shutter control circuit, 26 ... Zoom drive circuit, 27 ... Zoom encoder, 28 ... Release input circuit, 29 ... Zoom input circuit, 30 ... Display circuit,
31 ... Magnetic recording circuit, 32 ... Film feeding circuit, 33 ...
Control circuit.

Claims (3)

[Claims] 1. A reduction optical system for forming a subject image in the same range as a subject image formed on a film surface in an adapter detachable from a camera body, and an image formed by the reduction optical system. Receives the subject image,
A housing that includes an image sensor that outputs an image signal, a storage unit that stores the image signal output from the image sensor, the reduction optical system, the image sensor, and the storage unit, and is detachable from the camera body. And a camera adapter capable of electrically recording the subject image. 2. An adapter detachable from a camera body, the adapter being arranged at a position for receiving a subject light flux from a photographing lens,
A reduction optical system for forming a subject image in the same range as the subject image formed on the film surface, and receiving the subject image formed by the reduction optical system,
A housing that includes an image sensor that outputs an image signal, a storage unit that stores the image signal output from the image sensor, the reduction optical system, the image sensor, and the storage unit, and is detachable from the camera body. And a communication means for communicating with the control means in the camera body, the body image being electrically recorded by mounting the housing on the camera body. Possible camera adapter. 3. An adapter detachably attached to a camera body, the adapter being arranged at a position for receiving a subject light flux from a photographing lens,
A reduction optical system for forming a subject image in the same range as the subject image formed on the film surface, and receiving the subject image formed by the reduction optical system,
An image sensor for outputting an image signal, a storage unit for storing the image signal output from the image sensor, a communication unit for communicating with the control unit of the camera body, and a photographing optical system of the camera body. A retracting unit that retracts at least one of the reduction optical system and the image pickup device when retracting or retracting to shorten the focal length; and the image pickup device, the reduction optical system, the storage unit, the communication unit, and the above. A camera adapter, comprising: a housing in which a retracting means is arranged, and which is capable of electrically recording the subject image by mounting the housing on the camera body.