JPS6155104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data imprinting device for a camera, and more particularly, to a data imprinting device for imprinting data such as a photographing date onto a film in a camera.

2. Description of the Related Art Conventionally, various devices have been provided for imprinting data such as the date of photography on film in a camera.

These can be roughly divided into: (1) cameras that have a data transfer mechanism built into the camera from the beginning and transfer data from the surface of the film, and (2) cameras that use the back cover of the camera and transfer data into the camera back. It incorporates a data imprinting mechanism such as a dial and attached electric circuit necessary for imprinting, and imprints data from the back of the film.

However, in any of these methods, the electrical signal that activates the data copying mechanism is taken from the camera's X contact or an electrical contact that is closed by the reciprocal movement of the shutter release lever. Since the above-mentioned electrical signal is generated electrically from the beginning in connection with the photographic exposure operation, the electrical cord and electrical terminal for guiding it to the electrical circuit of the data imprinting device are connected to the camera. There is an inconvenience that must be provided on the body.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks of the conventional data recording device of a camera by picking up a portion of the light during photographing, that is, when exposing the film, and transmitting it to the data recording device. It is an object of the present invention to provide a data recording device for a camera which eliminates the above-mentioned drawbacks by using a trigger signal to operate the trigger signal and obtaining the trigger signal optically.

The present invention will be explained below with reference to an illustrated embodiment.

In the embodiments described below, the present invention is applied to a camera having a focal plane shutter, but it goes without saying that the present invention may also be applied to a camera having a lens shutter.

As shown in FIG. 1, a focal plane shutter 3 is disposed on the front side of a film 2 loaded into a camera body 1. As shown in FIG. A photographing lens 4 is disposed in front of it on the optical axis O of the photographing lens. As is well known, when the shutter 3 is released,
It serves to open the exposure paths and expose the film 2 to the photographic light that has passed through the photographic lens 4.

The film 2 disposed behind the shutter 3 is disposed so as to correspond to a photographic image area 1a formed between the shutter 3 and the film 2, that is, a mask section formed on the body 1. ing. This is because a pressure plate 7 elastically supported by springs 6a and 6b on the back cover 5 of the camera presses the back side of the film 2, thereby regulating the correct position of the film 2 in the front-back direction. It is beginning to be practiced.

In the present invention, a light receiving hole 8 is provided in a part of the pressure plate 7 supported by the back cover 5 in this manner. At least one light-receiving hole 8 is bored in a portion of the pressure plate 7 corresponding to the film photographing area.
A light receiving element 9, such as a silicon photocell or a photodiode, is arranged in the back cover 5 in correspondence with the light receiving hole 8.

Further, a window hole 10 for data recording is provided near one side edge of a portion of the pressure plate 7 corresponding to the photographic image area 1a, and behind this window hole 10, a back cover 5 is provided. A light emitting body 11 appropriately supported is disposed. This light emitting body 11 is composed of, for example, a lamp, and is connected to a data recording electric circuit (a third
(see figure). Further, a peripheral portion of a data plate 12 is arranged between the light emitting body 11 and the close hole 10. This data board 12 is
Its center portion is fixed to a shaft 13 that is rotatably supported by the back cover 5, and the data provided on its periphery is positioned between the light emitting body 11 and the window hole 10. . The outer end of the shaft 13 protrudes outward from the back cover 5, and a data dial 14 is fixed to the protrusion. Therefore, by rotating this dial 14, desired data on the data plate 12 to be imprinted on the film 2 can be positioned between the light emitter 11 and the window hole 10. Note that the light emitting body 11
As shown in FIG. 2, it is surrounded by a hood 11a and is configured to accurately irradiate data.

Also, inside the back cover 5, the light emitting body 11 is provided.
Electric circuit for data imprinting (see Figure 3)
A main switch 15 of the same circuit is incorporated. The main switch 15 is composed of, for example, a slide switch, and is adapted to be turned on and off manually. Therefore, when data is to be imprinted onto the film 2, this main switch 15 may be closed, and if data is not to be imprinted, this switch 15 may be left open.

Further, the electric circuit for data imprinting incorporated into the camera back 5 is constructed as shown in FIG. 3, for example.

This circuit consists of an integrating circuit A and a switching circuit B.
The main parts are made up of. The switching circuit B includes a main capacitor _C0 connected to the DC power supply E via the switch 15, and the light emitter 1 for projection connected to both ends of this capacitor _C0 .
1. A series circuit of NPN type transistor Q ₄ and a programmable unidirectional transistor PUT whose anode is connected to the positive side of the above power supply E and whose cathode is connected to the base of the above transistor Q ₄ via a resistor R ₁₄ . and connected to both ends of the above capacitor C ₀ , PNP type transistor Q ₆ , resistor R ₁₀ , NPN type transistor
A series circuit consisting of Q ₃ , a PNP transistor Q ₅ parallel to this, and a PNP transistor connected across the capacitor C ₀ .
Q ₂ , a capacitor C ₃ , and a resistor R ₅ in series, and an NPN transistor Q ₁ form the main body of the circuit.
Its main part is formed by an operational amplifier 16, a capacitor C ₂ , a resistor R ₂ , a reset switch S ₁ and a voltage divider circuit consisting of resistors R ₀ and R ₁ connected across the capacitor C ₀ . There is. The output terminal of this integrating circuit A is designed to output an output when the amount of received light reaches a certain value, and the output terminal is connected to a resistor R ₂
is connected to the base of the above transistor _Q1 through. The collector of this transistor Q ₁ is connected to the capacitor C ₀ via a resistor R ₁₂ and to the base of a PNP transistor Q ₂ via a resistor R ₃ .

The gate of the transistor PUT is connected to the collector of the transistor Q ₆ and connected to the capacitor C ₀ via a resistor R ₁₁ .
It is connected to the. Also, transistor Q ₆ ,
The emitters of Q ₅ and Q ₂ are also connected to capacitor C ₀ .

The base of the transistor Q ₆ above is connected to the resistor R ₈ ,
Through R ₉ and the base of the transistor Q ₅ are both connected through a resistor R ₆ to the connection point of the emitter 11 and the collector of the transistor Q ₄ . And between the base of the transistor Q ₆ and the collector of the transistor Q ₅ ,
Capacitor C ₁ is connected.

Further, a switch _S2 for selecting monofilm and color film is connected in parallel to both ends of the resistor _R9 . Furthermore, the connection point between the collector of the transistor Q ₂ and the capacitor C ₃ is directly connected to the negative electrode of the power source E via the resistor R ₄ , and the connection point between the capacitor C ₃ and the resistor R ₅ is connected to the connection point of the transistor Q ₃ . The base of is connected through resistor _R7 . Further, the collector of the transistor _Q5 is connected to the negative electrode of the power source E via a resistor _R13 .

In this case, the light receiving element 9 in the integrating circuit A is composed of a silicon photocell, and its anode is connected to the connection point of the resistors R ₀ and R ₁ and the positive input of the amplifier 16. end and is connected to the emitter of the transistor _Q1 above. The cathode thereof is connected to the negative input terminal of the amplifier 16, and a capacitor C ₂ is connected between the negative input terminal and the output terminal of the amplifier ₁₆ . reset switch
S ₁ is connected.

Next, the operation of the data imprinting device of the present invention in which the electric circuit thus configured is incorporated into the back cover 5 will be described.

Now, when the main switch 15 is closed and in a standby state for shutter release operation, no trigger signal is input to the gate of the transistor PUT, and the transistor PUT is in an off state.
Transistor _Q4 is also turned off, and the light emitter 11 is in the off state. In this state, the capacitor C ₁ is precharged by this current through the transistor Q ₆ in the direction shown in the figure, and the transistor Q ₆ side has positive polarity. In this state, when the shutter release operation of the camera is performed, the front shutter curtain of the focal plane shutter moves, the photographic exposure paths are opened, and the film 2 is exposed. When this exposure is performed, a part of the exposed light beam that has passed through the film 2 is
The light passes through the light receiving hole 8 shown in FIG. 1 and enters the light receiving element 9. When this is incident, the light receiving element 9 converts it into light and electricity, and the electrical signal is sent to the amplifier 16.
integrated by capacitor C ₂ via .
When the amount of light received reaches a certain value, the output of the amplifier 16 is applied to the base of the transistor _Q1 , turning it on. When this becomes conductive, the base of transistor Q ₂ also becomes the operating voltage, so transistor Q ₂ is also turned on.

When transistor Q ₂ becomes conductive, a differential pulse is applied to the base of transistor Q ₃ from a differentiator circuit consisting of capacitor C ₃ and resistor R ₅ , turning it on. Then, when the transistor Q ₃ is turned on, the gate of the transistor PUT is turned on, so that the PUT becomes conductive, and due to this conduction, the transistor Q ₄ is turned on, and the light emitting body 11 lights up.
By this lighting, the data plate 12 (see Figure 1)
The data is imprinted on film 2.

On the other hand, as transistor Q ₄ turns on, transistor Q ₅ also turns on at the same time, current flows as shown by the dotted line in Figure 3, and capacitor C ₁ is charged with the opposite polarity from its initial state. be done. Due to this charging, when capacitor C ₁ reaches a certain potential, transistor Q ₆ is turned on, so the operating potential applied to the gate of transistor PUT disappears, and the transistor
PUT is turned off and the light emitter 11 is turned off. The lighting time of the light emitter 11 is determined by the charging time until the capacitor C ₁ reaches a certain potential after lighting, and this charging time depends on the time constant of the resistors R ₈ and R ₉ and the capacitor C ₁ . You can decide accordingly.

In this embodiment, this time constant can be switched to two stages, resistor _R8 and resistor _R8 + _R9 , by a selection switch _S2 . That is, Switch S ₂
If it is released, the resistance will be R ₈ + R ₉ , and if the switch S ₂ is on, it will be the resistance R ₈ only. Then, by turning off the switch _S2 , the light emitter 1 is turned off.
By increasing the lighting time of 1 and shortening it by turning it on, suitable lighting times can be obtained for color films and monochrome films.

The reset switch _S1 of the integrating circuit A is for discharging the capacitor _C2 , and is closed manually or in conjunction with turning off the transistor PUT.
It serves to discharge the charge of capacitor _C2 .

Further, the level of the trigger pulse generated in the light emitting circuit for lighting the light emitter 11 may be set so that the trigger pulse is generated at the exposure time of the highest sensitivity commercially available film, and the maximum lighting time of the light emitter 11 is 30 msec. If the electric circuit is set up as shown below, the captured image will not be distorted even when the film is wound at high speed by a high-speed motor drive.

In this embodiment, as shown in FIG. 1, one light-receiving element 9 is provided in the photographic film field, but this is because the difference in brightness between each part of the subject is extremely large. Of course, two or more may be provided at appropriate positions in consideration of such cases.

Further, in the above embodiment, the light receiving element 9 is placed on the back side of the film, but it goes without saying that this may be any position as long as it receives the subject light during photographic exposure.

Next, another embodiment in which a light receiving element is arranged so as to receive incident light outside the photographic exposure optical path will be described with reference to FIG. Although this embodiment is a case in which the present invention is applied to a lens shutter camera, it goes without saying that the present invention can also be applied to a focal plane shutter camera in exactly the same manner. The electric circuit in this example is constructed in exactly the same manner as the electric circuit shown in FIG. Only the constituent members that are different from the previous embodiment, such as related members, will be explained. That is, as shown in FIG. 4, the film 22 loaded into the camera 21 is moved to the photographic image area 21a by a pressure plate 25 attached to the back cover 23 of the camera via a leaf spring 24. They are arranged regularly with respect to the mask portion. When the lens shutter 26 opens and closes, the arranged film is exposed by a bundle of exposure light that has passed through the photographing lens 27. This fact is well known.

For a camera configured as described above, the data imprinting device of the present invention is placed inside the dark box of the camera 21. This device uses the above-mentioned photographic lens 2.
7, which is placed near the photographic exposure path formed inside the camera's dark box, and receives light outside the photographic exposure path (including light reflected from the film surface) that enters the camera. Conversion element 9 and this element 9
A data imprinting electric circuit 20 (see FIG. 3) that is activated when an electric signal photoelectrically converted by the converter is applied as a trigger signal, and this electric circuit 2
It consists of a light emitter 11 that emits light when the light emitter 11 is activated, a data plate 31 illuminated by the light emitter 11, and a rotating mechanism for the data plate 31.

The light emitting body 11 is composed of, for example, a lamp, and is arranged at a position that does not interfere with the photographic exposure path on the side of the film surface.
It serves to irradiate the data and imprint it on the film 22 at an appropriate position. This luminous body 11
is connected to the data imprinting electric circuit 20 (see FIG. 3), and its light emission time is controlled by the same circuit. Further, this light emitting body 11 has a hood 11a as shown in FIG.
, and is configured to accurately irradiate the data on the data plate 31.

The center of the data plate 31 is rotatably supported by a support shaft 32, and the data plate 31 is arranged so that its peripheral edge is located between the light emitter 11 and the film 22, near the light emitter 11. There is. Data to be imprinted onto the film 22 is provided on the peripheral edge thereof. Therefore, the light emitter 11 irradiates this data, and the irradiated light is irradiated onto the film 22, so that the data is imprinted on the film. Further, this data plate 31 has a gear formed on its outer periphery, and an intermediate gear 33 meshes with this gear. This gear 33 has
A gear 35 fixed to a rotatably supported spindle 34 is engaged with the gear 35, which rotates a knob 36 fixed to the outer end of the spindle 34 that protrudes above the outer surface of the camera 21. By doing so, the data plate 31 is rotated via the gear 35 and the intermediate gear 33, so that desired data corresponds to the light emitter 11.

In the case of the apparatus of this embodiment constructed in this way, its operation is the same as that of the previous embodiment. That is, if the main switch 15 (see FIG. 3) is closed and the photographing exposure is performed, the above-mentioned effect can be achieved. The light-receiving element 9 receives object light, which is photoelectrically converted to generate an integrated trigger pulse to cause the light-emitting body 11 to emit light, and by this light emission, data is captured from the front side of the film.

As described above, the device of the present invention has no electrical contact and uses a light-receiving element to sense the amount of light exposed to the film, integrates it in an integrating circuit, and uses this as a trigger for a light-emitting circuit. It is. As a result, the following remarkable effects are achieved.

(1) Films are given a certain amount of exposure depending on their respective photosensitivity, so among commercially available films,
If you set the level so that a film with a sufficiently high sensitivity will trigger the imprint lamp's light emitting circuit, then a film with a lower sensitivity will have a sufficient trigger. This means that even if the subject has the same brightness, the shutter time varies depending on the film sensitivity, so the trigger circuit time (C ₂ in the circuit) must be set so that it turns on within the shutter time for the highest sensitivity. If this is determined, the greatest effect will be that any film can be photographed well.

(3) In addition, when detecting optical signals, brightness detection is
Depending on the brightness of the object, a sufficient trigger may not be applied, but since the present invention uses a light amount detection method, even a dark object is integrated over time, so a sufficient trigger voltage can be obtained.

As explained above, according to the present invention, there is no need for any troublesome electrical cords as in the past, and
Even when the subject is dark, the light is integrated and causes the light emitter to emit light, so the drawbacks of the conventional method can be successfully overcome.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a data recording device for a camera showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a light emitting body of the device shown in FIG. 1, and FIG.
A diagram showing an example of the electric circuit of the device shown in FIG. 1,
FIG. 4 is a sectional view of a main part of a data recording device for a camera showing another embodiment of the present invention. 1, 21... Camera body, 2, 22... Film, 9... Light receiving element, 11... Light emitting element, 12,
32...Data board, A...Integrator circuit, B...Switching circuit.

Claims (1)

[Scope of Claims] 1. A light-receiving element arranged to receive object light that enters the camera during photographic exposure, an integrating circuit that starts counting when the light-receiving element starts receiving light, and this integrating circuit. It consists of a switching circuit that operates when the output of the film reaches a value corresponding to the highest film sensitivity value of commercially available film, and a light emitter inserted between this switching circuit and a power supply. A camera data capture device that captures data.