JP2899839B2 - Infrared film 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 photographic camera such as a lens shutter camera and a single-lens reflex camera, and more particularly to a camera which can use an infrared film.

[0002]

2. Description of the Related Art When taking a picture with a photographic camera using an infrared film, it has been necessary to refocus the infrared light after the focus adjustment. This is because the chromatic aberration of the photographing lens is corrected within the visible light, so that the focal position of the infrared light is shifted from the focal position of the visible light. Therefore, a red or R mark is provided on the lens barrel as an infrared mark for correcting the focal position of infrared light with respect to the distance scale. When shooting with a manual focus camera using an infrared film, adjust the focus by looking through the viewfinder of the camera, read the distance indicated by the index by looking at the distance scale displayed on the shooting lens, and calculate the distance value at that time. This is the step of taking a picture in accordance with the infrared correction mark shown on the taking lens.

[0003]

Therefore, compared with the case where a normal film is used, there is a problem in operability since two operations of reading the distance scale and correcting the distance value are added. Further, when performing the correction operation, there is a problem in that the user takes his / her eyes away from the viewfinder and misses a photo opportunity. Also, when using an infrared film with an autofocus camera to shoot, after adjusting the focus using the camera's autofocus, switch the camera's focus mode to manual and use the same method as with the manual focus camera described above. The distance indicated by the index is read by looking at the displayed distance scale, and the distance value at that time must be photographed in accordance with the infrared correction mark shown on the photographing lens. There is a problem that a shutter chance is missed because the camera is released.

[0004]

According to the present invention, there is provided a distance detecting means for detecting a feeding position of a taking lens, a determining means for determining whether or not a film to be used is an infrared film,
By providing correction information output means for outputting information relating to the infrared correction of the photographing lens, and correction means for performing correction based on the correction information from the correction information output means when the film to be used is an infrared film by the discrimination means, thereby automatically setting the red color. An infrared film camera that performs external correction has been realized.

[0005]

Therefore, according to the present invention, even when an infrared film is used, a photograph can be taken without manually performing focus correction after performing focus adjustment as in the case of using a normal film. it can.

[0006]

An embodiment of the present invention applied to a single-lens reflex camera will be described below with reference to the drawings. FIG. 1 is an electric circuit diagram of the camera. In the figure, (μC) is a control microcomputer that controls a sequence related to autofocus control of the camera. (DM) is a distance measuring unit that transmits the subject distance measured through the photographing lens to the control microcomputer (μC). (LR) is a ROM (Rea) built in the taking lens.
d Only Memory), various information of the lens is transmitted to the control microcomputer (μC). (LD) is a lens driving unit that drives the taking lens under the control of the control microcomputer (μC). (EC) controls the aperture and shutter speed in order to obtain an appropriate exposure in the exposure control unit. And
(S) is an infrared film detection switch, which is closed when the infrared film is used. The infrared film detection switch (S) is a manually operated switch and is closed when the infrared film is used. We will amend as follows.

An embodiment of the present invention applied to a single-lens reflex camera will be described below with reference to the drawings. FIG. 1 is an electric circuit diagram of the camera. In the figure, (μC) is a control microcomputer that controls a sequence related to autofocus control of the camera. (DM) is a distance measuring unit that transmits the subject distance measured through the photographing lens to the control microcomputer (μC). (LR) is a ROM (Rea) built in the taking lens.
d Only Memory), various information of the lens is transmitted to the control microcomputer (μC). (LD) is a lens driving unit that drives the taking lens under the control of the control microcomputer (μC). (EC) controls the aperture and shutter speed in order to obtain an appropriate exposure in the exposure control unit. And
(I S) is an infrared film detection switch is closed when using infrared film. Infrared film detection switch (I S) is closed when using an infrared film in switch operating manual.

The switch (S1) is closed at the first stage of the operation of pressing down a release button (not shown). When the switch (S1) is closed, a "Low" level signal is input to the input terminal of the control microcomputer (μC). A signal is provided, and a ranging operation is started in response to the signal. The switch (S2) is closed in the second stage of pressing down the release button (not shown), a "Low" level signal is input to the input terminal of the control microcomputer (μC), the exposure control unit operates, and the photographing is performed. Is completed.

FIG. 2 is a flowchart for explaining the operation of the present invention.

The distance measurement operation is started in step # 1 by the first step of the release operation. In step # 2, lens information is input from the ROM of the interchangeable lens. In step # 3, the focusing lens is controlled based on the distance measurement data. Next, step # 4
It is determined whether the film to be used is an infrared film or not. If the film is not an infrared film, this routine is exited, the release operation is completed by the second release step, and the photographing is terminated. If it is determined in step # 4 that the film to be used is an infrared film, the focus is corrected in step # 5 based on the lens-specific infrared correction amount information input in step # 2. Then, the release operation is completed by the second release step, and the photographing is terminated.

In this embodiment, a manual switch has been described. However, it is also possible to display an infrared film on a film cartridge like a DX code and read the image when the camera film is loaded.

[0011]

According to the present invention, even when a photograph is taken using an infrared film, it is possible to take a picture without taking his / her eyes off the finder, as in the case of using a normal film.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a camera.

FIG. 2 is a flowchart illustrating the operation of the present invention.

[Explanation of symbols]

 μC control microcomputer DM distance measuring unit LR ROM LD lens driving unit EC exposure control unit IS infrared film detection switch S1 switch S2 switch

Claims (1)

(57) [Claims] 1. A distance measuring means for measuring a distance to a subject, a determining means for determining whether or not a film to be used is an infrared film, and a correction information output means for outputting information relating to infrared correction of a photographing lens. An infrared film camera, comprising: correction means for correcting, based on the correction information from the correction information output means, when the film to be used is determined to be an infrared film by the determination means.