JPH08220588A - Camera in which can be set film sensitivity out of set scope - Google Patents

Abstract

PURPOSE: To obtain an adequate exposure even though a film with the ISO sensitivity out of the automatic setting scope of a camera, without increasing the cost, by operating an operation member in an operating procedure different from that in a photographing time, and designating a film sensitivity which cannot be read by a sensitivity reading means, to an exposure control means. CONSTITUTION: When a main switch 15 is turned on simultaneously for a specific time in the ON condition of a zoom-down switch 17, the sensitivity can be set at a specific ISO sensitivity less than the ISO sensitivity which can be set automatically from the DX code of a film. And when the main switch is turned on simultaneously for a specific time in the ON condition of a zoom-up switch 16, a specific ISO sensitivity higher than the ISO sensitivity which can be set automatically from the DX code of the film can be set. That is, a film out of the ISO sensitivity setting scope can be used by the combining operation of the existing switches, without preparing the DX sections to read the DX code, more than the necessary number. Furthermore, a cost up can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera which can be manually operated to set a film sensitivity exceeding a film sensitivity read by a sensitivity reading means.

[0002]

2. Description of the Related Art Conventionally, the ISO speed of a film has been automatically set by reading a DX code written on a film cartridge by a sensitivity reading means and instructing the exposure control means.

[0003]

However, as described above, the conventional technique uses the DX code described in the film cartridge. Therefore, when the DX code written on the cartridge is outside the automatic setting range of the camera, the ISO speed specified by the film is not set, and the proper exposure cannot be obtained.

The present invention has been made in view of the above problems, and it is an object of the present invention to obtain a proper exposure even with a film having an ISO speed outside the automatic setting range of the camera without increasing the cost. There is.

[0005]

In order to achieve this object, a first aspect of the present invention relates to a sensitivity reading means for reading the sensitivity of a photographic film, and an exposure control for performing exposure control corresponding to the sensitivity read by the sensitivity reading means. Means and an operation member for instructing the exposure condition to the exposure condition by a photographer's operation, and by operating the operation member in an operation procedure different from that at the time of photographing, the film that cannot be read by the sensitivity reading means The sensitivity is instructed to the exposure control means.

According to a second aspect of the present invention, a sensitivity reading unit for reading the sensitivity of a photographic film, an exposure control unit for performing exposure control corresponding to the sensitivity read by the sensitivity reading unit, and an exposure control unit operated by a photographer. A first operation member and a second operation member for instructing an imaging condition, and by operating the first operation member and the second operation member at the same time in a combination operation procedure different from that at the time of imaging, the sensitivity reading means can read. No film speed is configured to indicate to the exposure control means.

[0007]

In the first aspect of the present invention having the above-mentioned structure, the exposure control means is instructed of the film sensitivity that cannot be read by the sensitivity reading means by operating the operation member in an operation procedure different from that at the time of photographing. Proper exposure can be obtained even for films with film sensitivities outside the camera's automatic setting range without incurring the cost increase required for setting film sensitivities.

In the second aspect of the invention, the exposure control means controls the film sensitivity that cannot be read by the sensitivity reading means by simultaneously operating the first operation member and the second operation member in a combination operation procedure different from that at the time of photographing. As described above, since the combination operation is performed on the two operation members, which is obviously different from that at the time of shooting and photographing, the film sensitivity can be set surely without erroneous operation.

[0009]

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

FIG. 1 is a block diagram showing an embodiment of a camera capable of setting a film sensitivity outside the range according to the present invention.

In FIG. 1, a CPU 1 is a one-chip microcomputer and controls the entire sequence of the camera. The CPU 1 has a RAM, a timer function for measuring time, a counter function, an A / D conversion function, and the like. The CPU 1 includes a power supply circuit 3, a display device 4 (hereinafter, referred to as LCD 4), and a non-volatile memory 5.
(Hereinafter referred to as EEPROM 5), AF circuit 6, AE
The circuit 7, shutter 8, strobe circuit 9, motor driver circuit 10, film photo interrupter 13, and lens barrel photo interrupter 14 are connected.

The CPU 1 includes a main switch 15 and a zoom-up switch 1 as operation members operated by a photographer.
6, a zoom down switch 17, a back cover switch 18, a half press switch 19 of a release button, and a full press switch 20 of a release button are connected.

The power supply circuit 3 uses the battery 2 as a power source, regulates the battery voltage and supplies it to each circuit. The display device 4 displays shooting information such as the shooting mode, the number of films, the zoom position, and the date. The EEPROM 5 is prewritten with predetermined data necessary for the photographing process. This predetermined data is stored in the CPU when it is necessary to perform a predetermined process.
1 reads.

The AF circuit 6 sends distance measurement data corresponding to the distance to the subject to the CPU 1, and the CPU 1 calculates the distance to the subject. The AE circuit 7 transmits photometric data according to the brightness of the subject to the CPU 1, and the CPU 1 calculates the shutter speed and aperture value of the shutter 8 from the photometric data and the ISO sensitivity of the film. The shutter 8 opens and closes a shutter sector at the calculated shutter speed and aperture value to perform exposure.

The strobe circuit 9 comprises a strobe condenser booster and a light emission controller, and controls boosting and light emission by a signal from the CPU 1. Motor driver circuit 10
Responds to a signal from the CPU 1 to cause the film motor 11 for zooming up and zooming down the lens barrel and the lens barrel motor 12 for film feeding to rotate in the forward and reverse directions or to stop.

The film photo interrupter 13 sends a pulse signal to the CPU 1 in response to the feeding of the film.
The CPU 1 counts the feeding pulse signal and controls the motor driver circuit 10. Lens barrel photo interrupter 14
Transmits a pulse signal to the CPU 1 according to zoom-up and zoom-down of the lens barrel, and the CPU 1 controls the motor driver circuit 10 by counting the lens barrel pulse signal.

The main switch 15 is a momentary switch, and is a switch operating member that cyclically switches the camera to a photographable state and a photographable state each time it is turned on. The zoom-up switch 16 is a switch operating member for zooming up the lens barrel when turned on. The zoom-down switch 17 is a switch operating member for zooming down the lens barrel when turned on. The back cover switch 18 is a switch operating member that is turned on or off depending on whether the back cover of the camera is opened or closed.

The half-push switch 19 is a switch operating member which is turned on by half-pushing the release button.
When is turned on, the camera performs photometry and distance measurement. The full-press switch 20 is a switch operating member that is turned on by fully pressing the release button. When the full-press switch 20 is turned on, the camera performs an exposure process.

Below, among the programs written in the CPU 1, the ISO sensitivity is set manually,
The display and cancellation will be described.

FIG. 2 is a flow chart showing a zoom-up process and a zoom-down process of the camera in which the film sensitivity can be set outside the range, and the program is started by being called from a main routine (not shown).

When the main switch 15 is turned on and the camera is ready for photographing, when the zoom-up switch 16 is turned on, the ZUS process (zoom-up process) which is the zoom-up process from step S200.
To start. In step S202, it is determined whether the lens barrel has been driven to a predetermined position. If it is driven, the process proceeds to step S209, and if it is not driven, step S2
Go to 03. In step S203, the motor driver circuit 10 drives the lens barrel motor 12 in the zoom-up direction to a predetermined lens barrel position in response to a signal from the CPU 1, and proceeds to step S206.

When the main switch 15 is turned on and the camera is ready to shoot, when the zoom down switch 17 is turned on, the ZDS process (zoom down process) which is the zoom down process from step S201.
To start. In step S204, it is determined whether the lens barrel has been driven to a predetermined position. If it is driven, the process proceeds to step S209, and if it is not driven, step S2
Go to 05. In step S205, the motor driver circuit 10 drives the lens barrel motor 12 in the zoom-down direction to a predetermined lens barrel position in response to a signal from the CPU 1, and proceeds to step S206.

In step S206, it is determined whether the zoom-up switch 16 is turned on. If it is turned on, the process returns to step S202, and if it is turned off, the process proceeds to step S207. In step S207, it is determined whether or not the zoom down switch 17 is turned on. If it is turned on, the process returns to step S204, and if it is not turned on, the process proceeds to step S208.

In step S208, ZUS processing (zoom-up processing) and ZDS processing (zoom-down processing)
To return to the main routine (not shown).

Steps S202 and S204
Then, if the lens barrel is driven to the predetermined position, the process proceeds to step S209, and it is determined whether or not the ISO sensitivity is set by manual operation. If not set, the process proceeds to step S210. In step S210, it is determined whether the main switch 15 is on or off. If the main switch 15 is off, the process proceeds to step S206, and if it is on, the process proceeds to step S211.

In step S211, it is determined whether the timer 1 is counting. If it is counting, the process proceeds to step S213, and if it is not counting, step S2.
After proceeding to step 12 and starting the timer 1, step S21
Go to 3. In step S213, it is determined whether the timer 1 has timed out. If the time is not up, the process proceeds to step S206, and if the time is up, the process proceeds to step S214. In step S214, ZU
It is determined whether or not S processing is performed. If it is ZUS processing, the process proceeds to step S215, and it is determined that a predetermined ISO sensitivity higher than the ISO sensitivity that can be read from the DX code is selected, and the CPU
The data is set in a memory (not shown) which is a storage device in No. 1, and the process proceeds to step S217. If it is not ZUS processing, step S
If the predetermined ISO sensitivity lower than the ISO sensitivity that can be read from the DX code is selected, the CPU 1
It is set in a memory (not shown), which is a storage device inside, and the process proceeds to step S217.

In step S217, the upper digit of the ISO sensitivity set in the film number display section of the display device 4 is displayed, and the flow advances to step S218. In step S218,
It is displayed on the number-of-films display section of the display device 4 for a predetermined time, and the process proceeds to step S219. In step S219,
The display on the display device 4 is returned to the original display of the number of films, and the process proceeds to step S206. The upper digit of the ISO sensitivity set in the film number display section of the display device 4 is, for example, IS
If it is set to O1600, "16" is displayed and IS
If it is set to O50, "5" is displayed.

In this way, the zoom-up switch 1
By turning on the main switch 15 with 6 turned on and continuing to turn on at the same time for a predetermined time, a predetermined ISO sensitivity higher than the ISO sensitivity that can be read from the DX code can be set. Further, by turning on the main switch 15 with the zoom-down switch 17 turned on and continuing to turn on at the same time for a predetermined time, it is possible to set a predetermined ISO sensitivity lower than the ISO sensitivity that can be read from the DX code.

In step S209, if the ISO sensitivity is set manually, the process proceeds to step S220. In step S220, the zoom up switch 1
It is determined whether 6 is turned on. If it is not turned on, the process proceeds to step S208, and if it is turned on, the process proceeds to step S221. In step S221, it is determined whether or not the zoom down switch 17 is turned on.
If it is not turned on, the process proceeds to step S208, and if it is turned on, the process proceeds to step S222.

In step S222, it is determined whether the timer 2 is counting. If counting, step S
224. If not counting, step S223.
Go to step S224 after starting timer 2
Proceed to. In step S224, it is determined whether the timer 2 has timed out. If the timer 2 has timed out, the process proceeds to step S206. If the timer 2 has not timed out, the ISO sensitivity setting set by the manual operation is canceled in step S225, and then the process proceeds to step S206.

In this way, the zoom-up switch 1
6 and the zoom-down switch 17 are kept on for a predetermined time so that the ISO set by the manual operation is set.
The sensitivity setting can be canceled.

In the above-described embodiment, the ISO sensitivity set by the manual operation is released. However, as another method, the back cover of the camera is opened to open the back cover switch 18.
The setting can be canceled when is turned on. Also,
The setting can be canceled by replacing the battery 2 which is the power source of the camera.

Further, in the above-mentioned embodiment, the ISO speed is displayed on the film number display section of the display device 4, but it may be displayed on the date display section of the display device 4.

Furthermore, I set by manual operation
By writing the SO sensitivity information in the EEPROM 5, it is possible to prevent the setting from being canceled even if the battery 2 which is the power source is replaced.

According to the above examples, the ISO of the film
In the camera that controls the exposure according to the sensitivity, the main switch 1 with the zoom-down switch 17 turned on
If 5 is turned on at the same time for a predetermined time, a predetermined ISO sensitivity lower than the ISO sensitivity that can be automatically set from the DX code of the film can be set, and with the zoom-up switch 16 turned on, the main switch 15 is turned on at the same time for a predetermined time. IS that can be set automatically from the DX code of the film
A predetermined ISO sensitivity higher than the O sensitivity can be set.

That is, it is possible to use a film outside the ISO sensitivity setting range of the camera by a combination operation of existing switches without providing a DX section for reading a DX code more than necessary. In addition, the effect that the cost increase can be suppressed can be obtained.

[0037]

As described above, according to the camera capable of setting the film sensitivity outside the range of the present invention, in the first invention, the operation member is operated by an operation procedure different from that at the time of photographing, Since the film sensitivity that can not be read by the sensitivity reading unit is instructed to the exposure control unit, it does not increase the cost required for setting the film sensitivity, and the proper exposure is achieved even for films with film sensitivity outside the automatic setting range of the camera. Is obtained.

Further, in the second invention, the film sensitivity which cannot be read by the sensitivity reading means is changed to the exposure control means by simultaneously operating the first operation member and the second operation member in a combination operation procedure different from that at the time of photographing. As described above, since the combination operation which is obviously different from that at the time of photographing is performed on the two operation members, it is possible to reliably set the film sensitivity without erroneous operation.

[Brief description of drawings]

FIG. 1 is a block connection diagram showing an embodiment of a camera capable of setting a film sensitivity outside a range according to the present invention.

FIG. 2 is a flowchart showing an embodiment of a camera capable of setting a film sensitivity outside the range according to the present invention.

[Explanation of symbols]

 1 CPU 2 Battery 3 Power Supply Circuit 4 LCD 5 EEPROM 6 AF Circuit 7 AE Circuit 8 Shutter 9 Strobe Circuit 10 Motor Driver Circuit 11 Film Motor 12 Lens Tube Motor 13 Film PI 14 Lens Tube PI 15 Main Switch 16 Zoom Up Switch 17 Zoom Down Switch 18 Back cover switch 19 Half-push switch 20 Full-push switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyosada Machida 3 2-3 Marunouchi, Chiyoda-ku, Tokyo Nikon Corporation

Claims (10)

[Claims] 1. A sensitivity reading unit for reading the sensitivity of a photographic film, an exposure control unit for performing exposure control corresponding to the sensitivity read by the sensitivity reading unit, and an exposure control unit for controlling the exposure by a photographer's operation. An operation member for instructing a shooting condition is provided, and by operating the operation member in an operation procedure different from that at the time of shooting, a film sensitivity that cannot be read by the sensitivity reading unit is instructed to the exposure control unit. A camera that can be set outside the range of film sensitivity. 2. A sensitivity reading means for reading the sensitivity of a photographic film, an exposure control means for performing exposure control corresponding to the sensitivity read by the sensitivity reading means, and an exposure control means for operating the exposure control means by a photographer. The sensitivity reading means includes at least a first operating member and a second operating member for instructing an imaging condition, and operates the first operating member and the second operating member at the same time in a combination operation procedure different from that at the time of imaging. A camera capable of setting a film sensitivity out of the range, which indicates to the exposure control means a film sensitivity that cannot be read. 3. The first operating member according to claim 2, wherein the first operating member is a main switch for enabling or disabling the camera, and the second operating member drives the lens barrel from the telephoto side to the wide-angle side. A camera that can be set outside the range of film sensitivity, which is a zoom down switch. 4. The exposure control for controlling the exposure of film sensitivity unreadable by the sensitivity reading means by turning on the main switch while the zoom down switch is turned on and keeping the main switch on for a predetermined time or more. A camera capable of setting the film sensitivity outside the range, which is characterized by instructing the means. 5. The predetermined film sensitivity lower than the film sensitivity readable by the sensitivity reading means according to claim 3, wherein the main switch is turned on while the zoom down switch is turned on and kept on for a predetermined time or longer. To the exposure control means, the camera capable of setting the film sensitivity outside the range. 6. The zoom-up switch according to claim 2, wherein the first operation member is a main switch for setting the camera in a photographable state or a non-photographable state, and the second operation member is driven from the wide-angle side to the telephoto side. A camera that can be set outside the range of film sensitivity. 7. The exposure sensitivity control according to claim 6, wherein the main switch is turned on while the zoom-up switch is turned on, and the main switch is kept on for a predetermined period of time or more, whereby the film sensitivity that cannot be read by the sensitivity reading unit is controlled. A camera capable of setting the film sensitivity outside the range, which is characterized by instructing the means. 8. The predetermined film sensitivity higher than the film sensitivity that can be read by the sensitivity reading means by turning on the main switch while the zoom-up switch is on and keeping the main switch on for a predetermined time or more. To the exposure control means, the camera capable of setting the film sensitivity outside the range. 9. A camera capable of setting a film sensitivity outside the range according to claim 1 or 2, further comprising a storage device for storing the instructed film sensitivity. 10. The camera according to claim 9, wherein the storage device is a non-volatile memory, and the film sensitivity can be set outside the range.