JP3278290B2 - Data back mechanism for autofocus single-lens reflex camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data back mechanism for a back focus control type single-lens reflex camera.

[0002]

2. Description of the Related Art When a single-lens reflex camera is made into an AF, a control mechanism for adjusting a distance ring of a lens to focus on a subject is generally employed. As a method of driving the distance ring of the lens, the lens is driven by either a motor provided in the camera body or a motor built in the lens, and both have been put to practical use. All of these lenses are AF-only lenses,
Conventionally, it has been impossible to convert a lens to AF. Therefore, in order to perform an AF operation with a conventional MF lens based on a lens mount on which a conventional lens can be mounted and exchanged, the camera is divided into a front block and a rear block. The present inventor has already proposed a method of performing focusing by controlling the position of the film surface, that is, a so-called back focus control method (Japanese Patent Application No. 5-232296).

[0003]

When this single-lens reflex camera of the back focus control type is put into practical use, the entire movable block is housed in a front fixed block, the fixed block is formed as an exterior, and the movable block is externally mounted. A structure that is not exposed at all is conceivable. In such a structure, the film opening of the movable block moves from the back cover of the front fixed block according to the focus position. In general, a data bag for transferring data from the back cover to the film is provided on the back cover, and the condition is that the distance between the data back module and the film is constant. For this reason, in the back focus control type AF single-lens reflex camera having the movable block accommodation structure, the conventional data back type cannot be used. An object of the present invention is to provide a back focus control type AF single-lens reflex camera in which a camera body fixed block is configured as a dark box and a movable block is housed therein so that data information can be accurately projected on a film on the movable block side. To provide a data back mechanism.

[0004]

According to the present invention, there is provided a data back mechanism for an autofocus single-lens reflex camera according to the present invention, comprising a camera body fixing block including at least a lens mount for a photographing lens, and at least a film opening. A camera body movable block, an inter-block connecting portion that movably connects the camera body movable block to the camera body fixed block, a lens mount of the camera body fixed block and an opening of the camera body movable block based on AF information. A to adjust the distance of the part
An F drive mechanism, wherein the camera body fixing block is formed in a dark box configuration, the camera body movable block is accommodated therein, the camera body fixing block is formed as an exterior, and a film exchange is provided on the rear surface of the camera body fixing block. A camera provided with a back cover opening / closing mechanism, wherein a film holding pressure plate is provided on the camera body movable block side, and the film is held by locking the film holding pressure plate at a film opening of the camera body movable block. so as to retain the date by an external input key to be installed in the back cover back, to record the date and time information such as a film, a radiation signal synchronized with the imaging of the circuit module and the camera having a light-emitting display device for projecting information and a signal contact for obtaining placed on the pressure plate side, the pressure plate side circuit module and the information input keys
Connecting the data back circuit composed of a back cover side circuit module by a flexible printed circuit board having a front
Note that the position of the camera body movable block
The data information can be imprinted on the film .

The present invention also provides a camera body fixing block including at least a lens mount for a photographing lens, a camera body moving block including at least a film opening, and the camera body moving block movable relative to the camera body fixing block. And an AF drive mechanism that adjusts the distance between the lens mount of the camera body fixed block and the opening of the camera body movable block based on AF information. The camera body movable block is housed therein to make the camera body fixed block an exterior, and a back cover opening / closing mechanism for film exchange is provided on the rear surface of the camera body fixed block, and a film holding pressure plate is provided. Provided on the camera body movable block side and holding the film A camera having a pressure plate mechanism for pressing a pressure plate against a film opening of the camera body movable block, wherein the film holding pressure plate is provided with a through hole through which data information can be projected onto a film surface from the back cover side. According to the data information imprinting instruction by the operation, after the photographing operation starting from the release button operation signal is completed, the camera body movable block is set so that the distance between the back cover and the film is a predetermined distance from an arbitrary flange back position of the camera body movable block. Is moved, and at the time when the predetermined distance is reached, a signal is sent to the data back circuit module on the back cover side, and the data information is illuminated and emitted to the film, so that the data information can be imprinted. Have been.

[0006]

According to the above construction, data can be imprinted on the film even if the film opening of the camera body movable block moves from the back cover to an arbitrary position. Further, when it is determined by the photographer's intention that there is a request for imprinting data, the data can be imprinted by approaching the back cover side to a position where the film surface of the camera body movable block can be imprinted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. FIG. 1 is a schematic sectional view showing an embodiment of an autofocus single-lens reflex camera employing a data back mechanism according to the present invention. The camera body fixing block A includes an interchangeable lens 9, a lens mount 1, an AF driving mechanism 7, and a grip having a release button (not shown). The camera body movable block B includes an up-down mirror, a finder mechanism 5, an aperture 10, an exposure mechanism, a film feeding mechanism, and a distance measuring mechanism 3. The camera body fixing block A has a dark box configuration,
The camera body movable block B is completely housed inside, and the camera body fixed block A itself is an exterior.

Light from a subject (not shown) passes through the interchangeable lens 9, the optical path is guided upward by an up-down mirror, and enters the finder mechanism 5. Finder mechanism 5
Then, the light is guided by the pentaprism 5a so as to be parallel to the main optical axis and reaches the eyepiece 5b. Part of the subject light that has passed through the interchangeable lens 9 also enters the AF mirror 3a of the distance measuring mechanism 3, the optical path is guided downward, and reaches the AF sensor 3c via the AF lens 3b. The AF drive mechanism 7 includes a flange back drive motor 7a, an encoder 6 for detecting the rotation speed of the motor 7a, gears 7b and 7c, a lead screw 7d, and a female screw 7e. The lens drive 1 of the camera body fixing block A is driven by the AF driving mechanism 7.
The distance between the movable block B and the aperture (opening) 10 is adjusted. FIG. 1A shows an infinity shooting state, and FIG.
Indicates a state in which the distance has been adjusted to the closest shooting state.

Information indicating the positional relationship between the camera body fixed block A and the movable block B can be detected by the position detection switch 8. The sliding resistor 8a constituting the position detection switch 8 is fixed to the base of the camera main body fixed block A, and the end of the contact 8b is fixed to the base of the camera main body movable block B, respectively. , The resistance value of the sliding resistor 8a changes, and a BF (back focus) position detection signal can be obtained. The camera body fixed block A and the movable block B are connected by a connecting member (not shown), and the movable block B can be smoothly changed with respect to the camera body fixed block A by these members. A pressure plate mechanism including a pressure plate 29, a pressure plate holding plate 32, and the like is provided on the aperture 10 side of the camera body movable block B. The data back mechanism 30 is provided with the back cover 33 and a part thereof on the pressure plate 29 side, and is connected between them by a flexible printed board 31 (see FIGS. 2 and 3) described later.

FIG. 2 is a circuit diagram of the data back mechanism of FIG. 1, and is a diagram for explaining the operation of copying data information onto a film. The display unit (LC
D or LED) 15 and a keyboard 17 are connected. The keyboard 17 includes a mode button 17a, a select button 17b, and a set button 17c. The mode button 17a is used for the copy mode (year, month, day,
Button to select a mode in which imprinting is not performed and a mode in which date and time are corrected. The select button 17b indicates which part (year, month,
Button to select whether to modify the date, hour, minute, second, etc.). The set button 17c is a button for setting a correction value. When, for example, a date mode is selected with the mode button 17a, the current date is displayed on the display unit 15. The data back IC 16, the display unit 15, and the keyboard 17 are integrated as a data back module.

An imprint module 14 comprising an LCD 14a and a lamp 14b and an imprint signal contact 1
Reference numeral 3 is connected to the data back IC 16 via the flexible printed circuit board 31. When an imprint command is output from the data imprint command operation switch 12, the information is transmitted to the data back IC 16 via the imprint signal contact 13 and the flexible printed circuit board 31. The databack IC 16 turns on the lamp 14 b of the imprinting module 14 and imprints the date information on a part of the film 11.

FIG. 3 is a view showing details of the data back mechanism shown in FIG. 1, and is a perspective view showing a rear portion of the camera partially cut away. An inner rail (not shown) and an outer rail 45 are provided on the aperture of the camera body movable block B. The outer rail 45 is divided into three parts, and the yokes 22, 23, the permanent magnet 24 and the yokes 25, 2 are provided between the divided parts.
7. A permanent magnet 26 is embedded. Similarly, a yoke and a permanent magnet (not shown) are installed near the lower outer rail.

A wave-shaped electromagnetic iron plate 28 for suction is provided at a notch at the upper end of the pressure plate 29, and a wave-shaped electromagnetic iron plate (not shown) for suction is similarly provided at the lower end of the pressure plate 29.
The pressure plate 29 is fixed to the center of the pressure plate holding plate 32 that opens in a fan shape about the hinge 46 of the camera body movable block B as an axis. When the pressure plate holding plate 32 is tilted about the hinge 46 as an axis, the wave-shaped electromagnetic iron plate for adsorption is attracted to the permanent magnets buried near the upper and lower outer rails, and pulled out from the patrone 19 accommodated in the patrone chamber 18. Is held in the gap between the outer rail 45 and the inner rail.
The other end of the film 11 is connected to the spool 2 in the spool chamber 21.
Wound to zero. By adsorbing the pressure plate 29 with the magnet in this manner, a member such as a spring at the rear portion of the pressure plate can be omitted, so that the rear portion of the pressure plate becomes flat, and the imprint module 14 of the data back mechanism is easily installed on the pressure plate 29. Become.

A through hole 47 is provided in a part of the pressure plate 29,
An imprinting module 14 is attached to that part.
On the other hand, the data back module is provided inside the back cover 33, and the display unit 15 can be seen from the window of the back cover 33. Also, the mode button 17a of the keyboard 17,
The select button 17b and the set button 17c are
Operationally embedded in Imprint module 1
4 and the data back module are electrically connected by a flexible printed board 31, and the imprint contact 13 provided on the camera body movable block B is also connected by the flexible printed board 31. With this configuration, data information such as date can be imprinted on the film by the data imprint command without being affected by the position of the camera body movable block B.

FIG. 4 is a schematic sectional view of a camera showing another embodiment of the data back mechanism according to the present invention. FIG. 4 (a) shows a state in which the movable block of the camera main body is in a focusing position, and FIG. This shows a state in which data information is imprinted. This embodiment differs from the embodiment of FIG. 3 in that all functions of the data back circuit module 39 are provided on the back cover 41 side. The data back circuit module 39 includes a display unit 38, a film imprinting projection unit 36, and a data back IC. The film imprinting projection unit 36 faces the pressure plate side of the camera, and a pressure plate opening 37 for imprinting data information on a corresponding portion of the pressure plate 40.
Is provided. The back cover side imprinting signal contact 42 faces the imprinting signal contact 43 of the camera body movable block B, and a predetermined distance where the film imprinting projection unit 36 and the film surface come close by the movement of the camera body movable block B. It is configured to make contact immediately before

FIG. 5 is a flowchart for explaining the data imprinting operation of FIG. When performing data imprinting, first, a data imprinting command is given using an operation dial or a button on the camera body.
When the photographing is completed (S1), the CP for controlling the entire camera
U determines whether or not data imprint instruction data has been input (S2). If the data imprint command data is not input, the film winding operation is performed (S
3). If the data imprint command data has been input, the current flange back position (FBx) is read (S4). Then, to calculate the distance to the optimum position P imprinting to be constant distance projection portion 36 and the film surface imprinting film approaches (FB ₀ -FBx) (S
5) The movable block B of the camera body is moved to the optimum printing position P by the AF drive mechanism 7 (S6).

Then, it is determined whether or not the imprinting optimum position P has been reached based on the position data from the position detecting SW8 (S7). If the optimum position P has not been reached, F
B is controlled to reach the optimum position P by driving (S
8). Before reaching the optimum position P, the imprint signal contact 43 comes into contact with the imprint signal contact 42 of the data back module 39 on the back cover 41 side, so that signals can be exchanged. CP
When U determines that it has reached the optimum position P, a copying permission signal is generated from the camera body movable block B side (S9),
The lamp of the film imprinting and projecting section 36 is turned on for the time necessary for imprinting (S10), and the imprinting of the data on the film is completed (S11). Then, the operation shifts to the film winding operation for the next photographing (S3). If it is better to return to the focus position for general photography after the data imprinting is completed, a logical operation for immediately returning to the stored FBx position can be executed. In addition, if this operation is performed at high speed after the photographing is completed before the mirror is lowered, it is possible to avoid a sense of incongruity in focusing when data is imprinted even when looking through the finder in continuous photographing.

[0018]

As described above, according to the present invention,
A back focus control type AF single-lens reflex camera, in which the camera body fixed block is configured as a dark box and a movable block having an opening is housed inside, a data back mechanism that can accurately print data information on the film on the movable block side There is an effect that it can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an autofocus single-lens reflex camera employing a data back mechanism according to the present invention.

FIG. 2 is a schematic diagram showing a circuit configuration of a data back circuit module, and is a diagram for explaining an operation of copying data information onto a film.

FIG. 3 is a rear perspective view of the camera showing details of the data back mechanism of FIG. 1;

FIGS. 4A and 4B are schematic cross-sectional views of a camera showing another embodiment of the data back mechanism according to the present invention, wherein FIG. 4A shows a state where the main body movable portion is at a focus position, and FIG. This shows the state of being inserted.

FIG. 5 is a flowchart for explaining a data imprinting sequence of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens mount 2 ... Film surface 3 ... Distance measuring mechanism 5 ... Finder mechanism 6 ... Encoder 7 ... AF drive mechanism 8 ... Position detection SW 9 ... Interchangeable lens 11 ... Film 12 ... Operation switch 13 ... Imprint signal contact 14 ... Copy Built-in module 15 Display unit (LCD or LED) 16 Data back IC 17 Keyboard 18 Patrone room 19 Patrone 20 Spool 21 Spool room 22, 23, 25, 27 Yoke 24, 26 Permanent magnet 28 Attraction wave type electromagnetic iron plate 29, 40 ... Pressure plate 30 ... Data back block 31 ... Flexible printed circuit board 32 ... Pressure plate holding plate 33, 41 ... Back cover 34 ... Lock part 36 ... Film imprinting projection part 37 ... Press plate opening 38 ... Display Part 39: Data back circuit module 42: Back cover side imprint signal contact 4 ... signal contact imprinting movable block side

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 7/11 G03B 17/24 G03B 17/02 G03B 17/28

Claims (2)

(57) [Claims] 1. A camera body fixed block including at least a lens mount for a photographing lens, a camera body movable block including at least a film opening, and a block for movably connecting the camera body movable block to the camera body fixed block. An AF that adjusts a distance between a lens mount of the camera main body fixed block and an opening of the camera main body movable block based on the AF connection information;
A drive mechanism, wherein the camera body fixing block is configured as a dark box, and the camera body movable block is accommodated therein to form the camera body fixing block as an exterior, and a film replacement is provided on the rear surface of the camera body fixing block. A camera provided with a back cover opening / closing mechanism, wherein a film holding pressure plate is provided on the camera body movable block side, and the film is held by locking the film holding pressure plate to a film opening of the camera body movable block. to make it in order to record the date, time and date information, such as a film by an external input key to be installed in the back cover back to obtain a radiation signal synchronized with the imaging of the circuit module and the camera having a light-emitting display device for projecting information and a signal contact placed on the pressure plate side for, back side times with the pressure plate side circuit module and the information input keys A data back circuit composed of a circuit module and a flexible printed circuit board, and the camera body
Film is not affected by the position of the movable block
A data back mechanism for an autofocus single-lens reflex camera, wherein data information can be imprinted . 2. A camera body fixed block including at least a lens mount for a photographing lens, a camera body movable block including at least a film opening, and a block for movably connecting the camera body movable block to the camera body fixed block. An AF that adjusts a distance between a lens mount of the camera main body fixed block and an opening of the camera main body movable block based on the AF connection information;
A drive mechanism, wherein the camera body fixing block is configured as a dark box, and the camera body movable block is accommodated therein to form the camera body fixing block as an exterior, and a film replacement is provided on the rear surface of the camera body fixing block. A camera having a back cover opening and closing mechanism, and a pressure plate mechanism for providing a film holding pressure plate on the camera body movable block side, and pressing the film holding pressure plate against a film opening of the camera body movable block. The film holding pressure plate is provided with a through-hole through which data information can be projected onto the film surface from the back cover side, and after the photographing operation is started from a release button operation signal by a photographer's operation to instruct data information imprinting, the camera body is moved. From the arbitrary flange back position of the block, the distance between the back cover and the film is the specified distance. The camera body movable block is moved as described above, and at the time when the predetermined distance is reached, a signal is sent to the data back circuit module on the back cover side to irradiate and emit data information on the film, thereby imprinting the data information. A data back mechanism for an autofocus single-lens reflex camera, characterized in that: