JPH0616951U - camera - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents shooting on film with an inappropriate sensitivity,
Provide a camera that can be easily replaced with a film having appropriate sensitivity. [Structure] When a film is loaded into the camera and the back cover of the camera is closed (step 21), the film information reading means reads the film information (step 22). When the read film sensitivity is higher than a predetermined value, the film is wound up to the shooting start position (step 24). If the film sensitivity is below a predetermined value, the film is not wound (step 26). In this case, a warning indicating that the sensitivity of the film is inappropriate is given (step 27).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a camera having film feeding means for feeding a film to a shooting start position.

[0002]

[Prior art]

 A camera having a film feeding means for automatically feeding (rolling up) a film to a shooting start position is known.

In such a camera, a film patrone is loaded into the patrone chamber, and then the back cover of the camera is closed to turn on a motor operation switch of the film feeding means, so that the film is uniformly moved to the photographing start position. Be rolled up.

By the way, the conventional camera is designed so as to be compatible with almost all existing films having sensitivity (for example, ISO sensitivity of 100 to 3200).

That is, in order to obtain a good image even when a film having a low sensitivity (for example, ISO sensitivity of 100) is used, the photographic optical system opening diameter is designed to be large or a large-capacity strobe is mounted. However, a camera shake prevention mechanism has been mounted, but this causes a problem of increasing the size of the camera.

With the recent spread of relatively high-sensitivity films (for example, ISO sensitivity of 200 or more), it is possible to reduce the size of the camera by designing the camera on the assumption that such film is used. Conceivable.

However, there are low-sensitivity films with an ISO sensitivity of 100 or less in the market, and when a low-sensitivity film is loaded into such a camera and shooting is performed, the sensitivity of the film is Since it is insufficient, the depth of field is reduced, the shutter speed is reduced, etc., and it becomes difficult to obtain a good image.

Further, as described above, the film feeding means uniformly winds up the loaded film, so that the film is exchanged even if the film sensitivity is insufficient immediately before the photographing. End up wasting time rewinding the film. In addition, rewinding the film to its original state may require a great deal of effort depending on the camera structure. Furthermore, if the back cover of the camera is opened while the film has been wound up to the shooting start position, the first few sheets of film or, depending on the structure of the camera, all the film is exposed and wasted.

[0009]

[Problems to be solved by the device]

 The purpose of the present invention is to prevent shooting with a film with an inappropriate sensitivity when shooting with a camera that has a film feeding mechanism that winds the film to the shooting start position, and It is to provide a camera that can be easily replaced.

[0010]

[Means for Solving the Problems]

 Such an object is achieved by the present invention described in (1) and (2) below.

(1) A film feeding means for feeding a film to a photographing start position, a patrone chamber for accommodating a film patrone, and a sensitivity reading means for reading information on the sensitivity of the film loaded in the patrone chamber. The camera is characterized in that the sensitivity reading means reads the sensitivity of the loaded film, and when the sensitivity is out of the proper range, the film is not fed.

(2) The camera according to (1) above, which is configured to give a warning when the sensitivity of the film is out of the proper range.

[0013]

DETAILED DESCRIPTION OF THE INVENTION A camera of the present invention will be described in detail below with reference to the accompanying drawings.

In the camera of the present invention, when the sensitivity of the film loaded in the cartridge chamber is appropriate, the film is rolled up to the shooting start position, and when the sensitivity of the loaded film is out of the appropriate range, The film is not rolled up to the shooting start position.

A perspective view of a preferred example of the camera of the present invention is shown in FIG.

In the camera body 30 of the camera 3, a cartridge chamber 34 and a spool chamber 41 are formed as a film transport system.

In the cartridge chamber 34, a fork 35 fitted to one end of a film winding shaft installed in the film cartridge and a DX code carrying film information such as sensitivity and number of films are stored. A film information reading contact 36 for reading film information is provided. The film information reading contact 36 has a structure in which a plurality of protruding contacts are arranged along the width direction of the film.

In the spool chamber 41, a spool 42 for winding the film and a gear 44 for perforating the film are provided, and the film is wound up to a shooting start position (loading) or for each shooting. And a sprocket 43 for winding up one image of the film.

An aperture 38 and an aperture frame 39 are formed between the cartridge chamber 34 and the spool chamber 41, and a finder 37 is formed above the aperture 38.

A back cover 31 having a lock claw 32 is rotatably supported at the end of the camera body 30 on the spool chamber 41 side, and at the end of the camera body 30 on the cartridge chamber 34 side. A locking portion 45 that locks the lock claw 32 is formed. A back cover opening lever 33 for opening the back cover 31 is installed on the side surface of the camera body 30 near the locking portion 45.

In this case, when the back cover 31 is closed, the lock claw 32 is locked by the locking portion 45, and at this time, the lock claw 32 and the back cover opening lever 33 are internally coupled to each other, and the back cover opening lever 33 is pressed and moves to the upper side of the camera (arrow A side in FIG. 1).

When the back cover 31 is opened, the back cover opening lever 33 is moved to the lower side of the camera (arrow B side in FIG. 1). Then, when the opening lever 33 moves, the lock claw 32 disengages from the locking portion 45, and the back cover 31 opens.

Here, the back lid opening lever 33 is connected to a switch of a back lid opening / closing detecting means which will be described later, and the back lid 31 can be opened or closed depending on the position of the back lid opening lever 33. Is detected.

In the camera of the present invention, a photographing optical system, a strobe, etc. are designed in accordance with a film having proper sensitivity described later. Therefore, in the photographic optical system, for example, the open diameter of the lens can be made smaller and the strobe capacity can be made smaller, which is advantageous in downsizing the camera.

FIG. 2 is a block diagram showing a configuration example of the camera of the present invention.

The illustrated camera of the present invention includes at least a control unit 10, a film feeding unit 11, a main switch 12, a back cover opening / closing detecting unit 13, a film information reading unit 14, a photometric unit 15, a shutter driving unit 16, It has an aperture drive means 17, a motor drive control means 18 and a motor 19.

The control means 10 in FIG. 2 is constituted by a microcomputer, and when the sensitivity of the film loaded in the cartridge chamber 34 is appropriate, the film is wound up to the shooting start position and loaded. If the sensitivity of the film is outside the proper range, control is performed so that the film is not wound. In addition to this, sequence control, execution of autofocus, control of the entire camera such as exposure calculation are performed.

The filming start position of the film may be set in advance for each camera or may be set arbitrarily. For example, the shooting start position of the film may be a position where three frames have been fed from the lead portion of the film.

Whether or not the sensitivity of the film is appropriate is that the sensitivity of the film is equal to or higher than a predetermined value (only the lower limit is set), is equal to or less than the predetermined value (only the upper limit is set), or within a predetermined range. It is possible to judge that it is (set upper limit and lower limit respectively).

Further, the photometric means 15 has a light receiving element, and the light receiving element photoelectrically converts light from the subject and outputs a voltage of an amount corresponding to the amount of received light. This voltage value, that is, the photometric information obtained from the photometric means 15 is input to the control means 10 together with other information such as film sensitivity information, a predetermined arithmetic processing is performed, and an appropriate aperture is obtained based on the result. A combination of value and shutter speed is determined.

The shutter driving means 16 drives the shutter at a predetermined shutter speed, and the diaphragm driving means 17 adjusts the diaphragm to a predetermined diaphragm. In this case, the control means 10 outputs a command signal for executing the determined shutter speed to the shutter driving means 16, and outputs a command signal for executing the determined aperture value to the aperture driving means 17. Each is executed.

Further, the back lid opening / closing detection means 13 has a switch, and the back lid 31 of the camera is in either an open state or a closed state depending on the position of the back lid opening lever 33 connected to the switch. It is a device that detects whether or not. When the back lid 31 is open, the switch of the back lid opening / closing detecting means 13 is in the off state, and when the back lid 31 is closed, the switch of the back lid opening / closing detecting means 13 is in the on state.

Further, the switch of the back lid opening / closing detecting means 13 is also a switch for operating the film feeding means 11 which will be described later, and a signal indicating the ON state of the switch is inputted to the control means 10. Then, as will be described later, predetermined control is performed depending on the on / off state of the switch of the back lid opening / closing detecting means 13, that is, the open / close state of the back lid 31.

The film information reading means 15 is a device for reading various information of the film such as the sensitivity and the number of films carried by a DX code or the like on the film cartridge, and includes the film information reading contact 36.

The motor drive control means 18 controls the drive of the motor 19 of the film feeding means 11 that winds the film to the shooting start position. The winding amount or the feeding amount of the film to be fed is input from the film feeding means 11 to the control means 10 as the rotation amount or rotation time of the motor 19, for example.

Next, a preferred example of the operation of the camera of the present invention will be described with reference to the flowchart shown in FIG.

First, a film is loaded into the camera 3. This loading is performed by setting the cartridge in the cartridge chamber 34, covering the aperture 38 with the tongue portion of the film exposed from the cartridge, and hanging a part of the perforation on the toothed wheel 44 of the sprocket 43.

Next, the back lid open / close detection means 13 determines whether or not the back lid 31 is closed (step 21). When the back cover 31 is closed, the film information reading means 14 reads the film information (step 22).

Next, in the obtained film information, it is judged whether or not the sensitivity of the film is higher than a predetermined value (step 23). In this case, normally, the determination is made based on whether or not the ISO sensitivity x is larger than the ISO sensitivity x. The value of x may be set in advance for each camera or may be set arbitrarily. For example, an ISO sensitivity of 100 or less can be out of the proper range.

If the ISO sensitivity of the film is higher than a predetermined value, that is, it is appropriate, the motor 19 of the film feeding means 11 is driven to wind the film to the shooting start position (step 24). Then, the display of the photographing standby and various kinds of processing are performed, and when the main switch 12 is turned on, the photographing is ready (step 25). In this case, a good image can be obtained because the film having the proper sensitivity is set.

If the sensitivity of the film is less than or equal to the predetermined value, that is, it is out of the proper range, the film is not wound (step 26).

If the film has not been wound up, a warning is issued that the sensitivity of the film is improper, and that the film should be replaced with a film of proper sensitivity (step 27).

The warning method is not particularly limited, and examples thereof include audible and visual warnings, such as a buzzer, display on a liquid crystal display, blinking of a light emitting diode, and the like, and these may be used in combination in some cases. Moreover, the number of warnings, the time, and the like may be appropriately determined.

Next, when the photographer exchanges the film, the back lid 31 is opened and closed when the film is exchanged. Therefore, after step 27, it is determined whether or not the back lid 31 is opened (step 28). ). If the back cover 31 is open, the film is removed and a new film is loaded, and the process is repeated from step 21.

According to the present invention, even when a film having an improper sensitivity is loaded, the film is not wound (loading) as described in step 26. Therefore, when the film is removed, the film is wound around the spool 42. Since there is no work such as removing the tongue part, the removal work of the film can be performed easily and in a short time, and the film is not damaged. In addition, it is possible to prevent the film from being exposed to light by loading, so all the removed film can be used for shooting with another camera.

Further, when the back cover 31 is not open, it may be configured to return to the previous stage of step 27 and repeat the warning (step 27), or as shown in FIG. It may be configured to return to the latter stage and issue the warning (step 27) only once.

The above description has been given by taking the camera configured to automatically read the film information by closing the back cover as an example, but the present invention is not limited to this, and other The film information reading process (step 22) in the flowchart shown in FIG. 3 and subsequent steps may be performed by manually turning on a switch that directly operates the film feeding means. In this case, step 21 is changed to "switch on", step 28 is omitted, and after step 27 is "end".

[0048]

[Effect of device]

 The camera of the present invention can be downsized by designing the camera for a high-sensitivity film, for example, a film having an ISO sensitivity of 200 or more. When a film having a sensitivity outside the proper range is loaded, the film is not wound up to the photographing start position, so that the film having the proper sensitivity can be photographed and a good image can be obtained.

Further, even if a film patrone of a proper degree other than the proper one is accidentally loaded in the patrone chamber, the film is not fed, so that the film can be exchanged easily and in a short time. It is possible to prevent the film from being wasted.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a camera of the present invention.

FIG. 2 is a block diagram showing a configuration example of a camera of the present invention.

FIG. 3 is a flowchart showing an example of control by the control means of the camera of the present invention.

[Explanation of symbols]

 10 Control Means 11 Film Feeding Means 12 Main Switch 13 Back Lid Opening / Closing Detection Means 14 Film Information Reading Means 15 Photometric Means 16 Shutter Driving Means 17 Aperture Driving Means 18 Motor Driving Control Means 19 Motors 21-28 Step 3 Camera 30 Camera Body 31 Back lid 32 Lock claw 33 Back lid release lever 34 Patrone chamber 35 Fork 36 Film information reading contact 37 Finder 38 Aperture 39 Aperture frame 41 Spool chamber 42 Spool 43 Sprocket 44 Gear wheel 45 Locking part

Claims (2)

[Scope of utility model registration request] 1. A film feeding means for feeding a film to a photographing start position, a patrone chamber for accommodating a film patrone, and a sensitivity reading means for reading information on the sensitivity of a film loaded in the patrone chamber. A camera which is configured such that the sensitivity of the loaded film is read by the sensitivity reading unit and the film is not fed when the sensitivity is out of the proper range. 2. When the sensitivity of the film is not appropriate,
The camera according to claim 1, wherein the camera is configured to issue a warning.