JPS648322B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film sensitivity setting device. 2. Description of the Related Art Conventionally, devices are known that read the position of a code placed on a film container and automatically set the film sensitivity. Further, this automatic film sensitivity setting device is provided with a switch for artificially adjusting the film sensitivity, and a technique is disclosed in which the sensitivity setting is performed automatically and the correction thereof is performed manually.

However, in this conventional device, when a film container without a code is loaded, the film sensitivity cannot be set manually, which is inconvenient.

Furthermore, this conventional apparatus has the disadvantage that after the film sensitivity is set automatically, it is not possible to manually change the film sensitivity for the purpose of correction independently of the film sensitivity that was set automatically. The present invention has been developed in view of the above-mentioned problems, and includes a film having a film sensitivity signal section in which a conductive pattern is provided at a predetermined position of the film container depending on the sensitivity of the film stored in the film container. A film sensitivity setting device for a camera to be used includes a plurality of contact members for detecting the position of the conductive pattern of a film container loaded in the camera through electrical connection, and a plurality of contact members connected to the contact member members to detect the position of the conductive pattern on the film container loaded in the camera. a film sensitivity signal forming circuit that forms a film sensitivity signal according to the detection output of the contact piece member; and a warning means that issues a warning in conjunction with the fact that the position of the conductive pattern is not detected by the detection output of the contact piece member. a film sensitivity setting operating member for manually setting the film sensitivity; and forming an operating signal for changing the film sensitivity signal formed by the film sensitivity signal forming circuit in conjunction with the operation of the operating member. An operation switch transmits an operation signal from the operation switch to the film sensitivity signal forming circuit in the first state, and transmits the detection output of the contact member to the film sensitivity signal in the second state. A switch means for transmitting information to the formation circuit is provided, and the switch means is moved from the first state to the second state in conjunction with the opening/closing operation of the back cover, and the switch means is moved from the second state to the first state by operating the operating member. The purpose of the present invention is to provide a film sensitivity setting device that has undergone a transition to the following.

Since the present application is configured in this manner, the switch means (corresponding to the terminals 124A and 124B in the embodiment described later) is set to the second state (the conductor portion 130 in the embodiment described later) by opening and closing the back cover. 132) and a contact piece member (contact member 6, 8, 44 in the example described later) for detecting the pattern of the film container with respect to the film sensitivity signal forming circuit (resistor section 136 in the example described later). , 45, and 47), it is possible to automatically form a resistance value as a film sensitivity signal according to the pattern detected by the contact piece member. When no pattern is attached to the film container, the contact piece member does not detect the pattern, so a warning means (corresponding to the display section 140A in the embodiment described later) warns the photographer of this. Manual setting is instructed, and in conjunction with the operation of a film sensitivity setting operation member (corresponding to a dial 12' in an embodiment described later), an operation switch (corresponding to a contact portion 134 and a terminal 124c in an embodiment described later) is operated. ) to change the film sensitivity signal formed by the film sensitivity signal forming circuit (corresponding to a conduction signal by connecting the contact portion 134 and the terminal 124c in the embodiment described later). and the switch means is switched to the first position by operating the operating member.
state (terminals 124A, 124 in the embodiment described later)
B and the conductors 132 and 133), the contact piece member and the film sensitivity signal forming circuit are disconnected, and the operating switch and the film sensitivity signal forming circuit are connected instead, and the film sensitivity signal is formed. It is possible to shift the output of the circuit to a manually set value independently of the automatically set film sensitivity signal value.

Embodiments of the present invention will be described below with reference to FIG.

In the figure, 12' is the manual setting dial, 13
is a manual setting dial 12' and a toothed portion fixedly disposed thereon. 14 is manual setting dial 12'
The setting fixed index is fixed to a fixing member of the camera, such as an exterior plate. 100 is manual setting dial 1
It is rotatably attached to a base plate (not shown) with a shaft 2'. 102 is a pin for manual setting dial 12'
installed on the bottom surface of the Reference numeral 104 is a manual setting dial 1 which is tensioned between the shaft 100 and the pin 102 by a spring.
2' is always applied with a counterclockwise rotational force. 1
06 is a stopper for the pin 102 provided on the base plate (not shown). 108 is a pin for locking the spring 104, and is arranged on a base plate (not shown). 110, the click claw portion 110a and the manual setting tooth portion 13 engage with each other to click the manual setting dial 12'.

Reference numeral 112 is a locking lever, and a shaft 116 is attached to the base plate (not shown).
It is rotatably supported by a click pawl 110, and its one end 112a is provided so as to be able to come into contact with the back cover of a camera (not shown) when it is closed. A spring 114 applies a rotational force to the locking lever 112 in a counterclockwise direction about a shaft 116.

A spring 120 is provided between the shaft 116 and the click pawl 110, and applies a clockwise rotational force to the click pawl 110 about the shaft 116.

122 is a pin provided on the locking lever 112.

In the above configuration, when the back cover of the camera is opened, the locking lever 112 is moved from the shaft 11 by the spring force of the spring 114.
At the same time, the click pawl 110 is rotated counterclockwise by the pin 122 against the spring force of the spring 120 to disengage the tooth portion 13. When the click pawl 110 and the teeth 13 are disengaged, the manual setting dial 1
2' is rotated counterclockwise by the spring force of the spring 104, and the pin 102 comes into contact with the stopper 106 and stops. The manual setting dial 12' is configured so that the "SET" position is at the position of the index 14 at that time. When the back cover of the camera is closed, the locking lever 11
The end 112a of 2 contacts the back cover of the camera, the locking lever 112 rotates clockwise against the spring force of the spring 114, and the click pawl 110 engages with the teeth 13 of the manual setting dial to perform manual setting. Click by setting the dial 12'.

1 is a film container; 2, 4, 5, and 7 are conductive electrical signal terminals forming a film sensitivity signal section;
The film container that indicates film sensitivity information for ASA200 has electrical signal terminals 2 and 5 on the casing of the film container, and the film container for ASA400 has electrical signal terminals 2 and 4, and In the case of a container, electrical signal terminals 2 and 7 are provided on the housing, and electrical signal terminals 2 and 4, 2 and 5, and 2 and 7 of each film container are in a conductive state. Reference numerals 6, 8, 44, 45, and 47 are conductive terminals constituting the film sensitivity information detection section of the camera, and when the film container 1 having the film sensitivity signal section is loaded into the camera, the electrical signal terminals 2, 5,
4 and 7, and are held by an insulating member (not shown) in the vicinity of the film container storage section so as to be in contact with the film containers 4 and 7, respectively. Conductive terminals 6 and 8 are arranged to connect to electrical signal terminal 2.

Therefore, when the ASA200 film container is loaded into the camera, the electrical signal terminal 2 connects to the conductive terminals 6 and 8.
The electrical signal terminals 5 are in contact with the conductive terminals 44, respectively. In the case of an ASA400 film container, the electrical signal terminals 2 and 4 are the conductive terminals 6, 8, and 45.
In the case of an ASA800 film container, the electrical signal terminals 2, 7 are in contact with the conductive terminals 6, 8, 47, respectively.

124 is a brush with three terminals, and 12 between each terminal.
4A-124B-124C are in a conductive state. 1
26 is a brush with two terminals, and between the terminals 126A-
126B is in a conductive state. brushes 124 and 12
6 are configured to be insulated from each other and rotate integrally with each other, and rotate in conjunction with the rotation of the manual setting dial 12'.

128 is a shaft for rotating the brushes 124 and 126. 130 and 131 are conductor parts, and when the scale of the manual setting dial 12' is at the "SET" position, the terminals 124B of the brush 124 and 130 come into contact, and the brush 1
26 terminals 126B are provided so as to be in contact with 131. The conductor part 130 has the conductive terminal 6 and the conductor part 1
31 are connected to the conductive terminals 8, respectively.

Reference numerals 132 and 133 denote conductor parts, and when the brushes 124 and 126 rotate about the shaft 128 in conjunction with the rotation of the manual setting dial 12', the respective terminals 124A and 126A of the brushes come into sliding contact.

One end of the conductor section 132 is connected to the power supply section 10, and one end of the conductor section 133 is connected to one end of the exposure meter.
134 is a contact, 134-10, 134-2, 13
This is a collective contact portion consisting of 4-4, 134-8, . Each contact of the collective contact part 134 is connected to the brush 1
24 is provided so as to come into sliding contact with the terminal 124c when it rotates in conjunction with the rotation of the manual setting dial 12'.

The contact 134-2 of the collective contact section 134 is connected to the conductive terminal 44 of the camera-side film sensitivity information detection section, the contact 134-4 is connected to the conductive terminal 45, and the contact 134-8 is connected to the conductive terminal 47. Connecting.

136 is a resistor section. One end 136A of the resistor section 136 is connected to a connection point between the exposure factor input setting device 84 and the exposure meter 82, which input shutter speed information or aperture information. 138 is the resistor section 13
6 and each contact 134-2, 13 of the collective contact part 134
4-4, 134-8, . . . .

When the manual setting dial 12' is aligned with the scale of ASA800, the terminal 124c of the brush 124 becomes contact 1.
34-8, and end 136A of resistor 136
The length of the resistor between the two constitutes a resistance that corresponds to the film sensitivity information of ASA800. ASA400,
When adjusting the manual setting dial 12' on the ASA200 to each scale, the terminal 124c will be connected to each contact point 134.
-4 and 134-2 respectively, and the resistor body part 13
The length of the resistor between the resistor and the end 136A of the resistor 6 constitutes a resistor corresponding to the film sensitivity information of ASA400 and ASA200, respectively.

D is a known exposure meter pointer scanning/detection means;
An exposure control circuit consisting of the exposure factor input setting means 84, resistor section 136, exposure meter 82, power supply section 10, brushes 124, 126, etc. is opened, and when the exposure meter pointer does not move, the shutter release operation or film winding is performed. Deactivate operation.

Reference numeral 140 denotes a display section of the exposure meter, which is provided on the exterior of the camera so that exposure factors such as shutter speed information or aperture information can be visually recognized by the deflection of the pointer of the exposure meter.

Next, the effects of this embodiment having the above configuration will be described.

When a film container without a film sensitivity signal section is loaded into the camera, the manual setting dial 12' is disengaged between the click pawl and the tooth section 13 by the spring force of the spring 114 by opening and closing the back cover of the camera. The counterclockwise rotational force of the spring 104 causes the pin 102 to rotate counterclockwise until it comes into contact with the stopper 106 and stops, and then automatically returns to the "SET" position. "SET" on the manual setting dial
By returning to the position, the terminals 124B, 126B of the brushes 124, 126 come into contact with the conductor parts 130, 131, respectively, and the terminal 124C of the brush 124 comes off from the collective contact part 112. (See Figure 5)
In the case of a film container that does not have a film sensitivity signal section, since it does not have any of the electrical signal terminals 2, 4, 5, and 7, the conductive terminals 6 and 8 are not electrically connected and the brush 1
24 terminal 124C is floating and resistor part 136
resistance is not input to the circuit and the exposure control circuit is opened,
The pointer of the exposure meter does not move and the pointer is on the exposure factor display section 14
It stops at the 0 warning position 140A. When the exposure meter pointer reaches the warning display section 140A, a known exposure meter pointer scanning/detecting means D is activated, preventing the shutter release from being locked or the film winding operation, and prompting the photographer to input and set film sensitivity information. Warn that there is no. The warning means may be a method in which a warning lamp is turned on when the pointer of the exposure meter comes to the warning display section 140A, so that the warning lamp can be visually recognized from the outside. For example, when the manual setting dial 12' is set to the film sensitivity of the loaded film, the ASA sensitivity is 100.
When set to 124B of the brush 124, the conductor part 1
33, and the terminal 124C contacts the contact 134-10.
and ends 136A and 134 of resistor 136
The resistance value determined by the length of the resistor between -10 is
This is input and set to the exposure control circuit as film sensitivity information corresponding to ASA sensitivity 100. Exposure meter 82
The pointer indicates the exposure factor information of the shutter speed information or aperture information at that time to the exposure factor display section 140.

When a film container having a film sensitivity signal section is loaded into the camera, for example, when a film container that indicates film sensitivity information of ASA400 is loaded, electrical signal terminals 2 and 4 forming the film sensitivity signal section are connected to the camera.
The common terminal 2 has a conductive terminal 6 on the camera side,
8 and terminal 4 contact 45, respectively.

The manual setting dial 12' returns to the "SET" position when a film container is loaded, but if the manual setting dial 12' is not operated and left in the "SET" position, the terminal 124C of the brush 124 becomes a collective contact. conductive terminal 4 without contacting any of the contacts of
The resistance value proportional to the length of the resistor between the connection point between 5 and the resistor section and the end 136A of the resistor section 136 is
The resistance value corresponding to the film sensitivity information of ASA400 is input to the exposure control circuit, and exposure control is performed by inputting the shutter speed information and aperture information input by other input means, and the exposure value at that time is set. is displayed on the exposure factor display section.

In the same way, when you load a film container that specifies the film sensitivity information of ASA800 into the camera, the ASA800
Electric signal terminal 2 forming the film sensitivity signal section of
and 7 are connected to the conductive terminals 6, 8, and 47 on the camera side, and the length is proportional to the length of the resistor between the connection point between the conductive terminal 47 and the resistor part and the end 136A of the resistor part 136. The resistance value is input and set to the exposure control circuit as a resistance value corresponding to the film sensitivity information of ASA800, exposure control is performed according to the shutter speed information and aperture information, and the exposure value at that time is displayed on the exposure factor display section. In this embodiment, when a film container having a film sensitivity signal section is loaded into the camera, the film sensitivity information specified by the film container is automatically input and set to the exposure control circuit, but priority is given to the manually set film sensitivity information by manual setting operation. You can input the following information.

That is, when a film container having a film sensitivity signal section (instructing ASA400) is loaded, the manual setting dial 12' is at the "SET" position, and unless the manual setting dial 12' is operated, the conductive terminal 45
A resistance value proportional to the length of the resistor between the connection point of the resistor body part 136 and the end part 136A is input and set to the exposure control circuit as a resistance value corresponding to the film sensitivity information of ASA400, but it is for manual setting. dial 1
If 2' is manually set to the scale of ASA800, for example, the terminals 124B, 126B of the brushes 124, 126 are disconnected from the conductor parts 130, 131, so the connection point between the conductive terminal and the resistor part 136 and the end part 136A are cut off.
A resistance value proportional to the length of the resistor between the contact point 134-8 and the end 136A of the resistor section 136, which is in contact with the terminal 124C of the brush 124, is not input and set.
A resistance value proportional to the length of the resistor between the two is input and set to the exposure control circuit.

Therefore, in this embodiment, when a film container is loaded, the manual setting dial is automatically returned to the "SET" position regardless of the presence or absence of the film sensitivity signal section, and the manual setting operation of film sensitivity information is automatically prepared. When loading a film container that does not have a film sensitivity signal section, a warning/safety device is automatically activated to prevent the user from forgetting to set the film sensitivity information. When a film container having the above-mentioned type is loaded, a resistance value corresponding to the film sensitivity information indicated by the film container is automatically input and set to the exposure control circuit, so that appropriate exposure control is effected. Furthermore, in this embodiment, when a film container having a film sensitivity signal section is loaded into the camera, it is possible to input and set the film sensitivity information using the manual setting means in preference to the automatic setting means, and correct the film sensitivity information. It has the effect that it can. Further, in this embodiment, since the resistor section 136 is used in common for the resistance as film sensitivity information for the manual setting means and the automatic setting means, it is possible to have the manual and automatic setting means together with a simple structure. or,
When a film container is not loaded into the camera, the exposure control circuit is opened to save power.

As described above, in the present invention, the film sensitivity can be set automatically by opening and closing the back cover, and when the film is not suitable for automatic setting, a warning and manual setting of the film sensitivity is also possible. Therefore, it is possible to provide a film sensitivity setting device with good performance.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a film sensitivity setting device according to the present invention. 1... Film container, 2, 4, 5, 7... Electric signal terminal forming a film sensitivity signal section, 6,
8, 44, 45, 47... Conductive terminal on the camera side, 10... Power supply section, 12'... Dial for manual setting, 110... Locking lever, 130, 131,
132, 133... Conductor part, 124, 126...
Brush, 134-10, 134-2, 134-
4,134-8...Terminal of collective contact part, 136...
...Resistor body part.

Claims (1)

[Claims] 1. A film sensitivity setting device for a camera using a film having a film sensitivity signal section provided with a conductive pattern at a predetermined position on the film container in accordance with the sensitivity of the film stored in the film container. a plurality of contact members for detecting the position of the conductive pattern of the film container loaded in the camera through electrical connection; and a plurality of contact members connected to the contact member and responsive to the detection output of the contact member. a film sensitivity signal forming circuit for forming a film sensitivity signal; a warning means for issuing a warning in conjunction with the fact that the position of the conductive pattern is not detected by the detection output of the contact piece member;
A film sensitivity setting operating member for manually setting the film sensitivity; and an operating switch for forming an operating signal for changing the film sensitivity signal formed by the film sensitivity signal forming circuit in conjunction with the operation of the operating member. In the first state, the operation signal from the operation switch is transmitted to the film sensitivity signal forming circuit, while in the second state, the detection output of the contact piece is transmitted to the film sensitivity signal forming circuit. The switch means is provided with a switch means for causing the switch means to move from the first state to the second state in conjunction with the opening/closing operation of the back cover, and to move from the second state to the first state by operating the operating member. A film sensitivity setting device characterized by: