JPS63262630A - Electronic still camera - Google Patents

Abstract

PURPOSE:To make viewing angle coincident with each other between a large- sized camera and an electronic still camera by recording one of the focal length value of the large-sized camera and the size of a film as a title and recording another of them with a scale for expressing the position of a zoom operation lever corresponding to the viewing angle on a scale plate for the zoom operation lever. CONSTITUTION:There are a title part 16 and a zoom indication part 17 on the scale plate 9 and on the title part 16 one of the focal length (f) value of a lens and the size value of the film used for the large-sized camera is recorded and on the zoom indication part 17 another of them is recorded with the scale 18 in the position of the zoom operation lever 4 corresponding to the viewing angle decided by both of them. In case of using the large-sized camera and the electronic still camera simultaneously, the scale plate 9 corresponding to the lens and the film used for the large-sized camera is selected and mounted to a scale plate holding device 10 of the electronic still camera and the zoom operation lever 4 is matched to the scale. Thus, the viewing angles of the large- sized camera and the electronic still camera can be easily made coincident.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an electronic still camera equipped with a zoom lens, and it is possible to easily match the angle of view when shooting simultaneously with a large-format camera using a silver halide film. It is designed to allow for.

<Prior Art> When professional photographers take commemorative photographs or commercial photographs in a studio or the like, they generally use a large-format camera with interchangeable lenses that uses 120.220 roll film or sheet film. In the case of Party B, when photographing subjects that may move, such as people, unlike photographing stationary objects,
The image you see through the viewfinder does not necessarily appear on the film. Therefore, photographers take multiple frames from the same angle and pose, and after processing, they call the client to the studio and ask them to select their favorite photo before enlarging it.

<Problems to be Solved by the Invention> However, it is troublesome for the photographer to go to the studio again and again, which takes time and effort.

Therefore, the applicant focused on one of the characteristics of electronic still cameras, which is that images can be played back immediately after shooting. developed a system that can display images on a monitor on the spot. According to such a system, the photographer can conveniently select a favorite photograph to be enlarged on the spot by viewing the image on the monitor.

In this case, the problem is how to make the angles of view of the large-format camera and the electronic still camera match, since the impression will be different if they do not match.

That is, large format cameras have interchangeable lenses and can be loaded with films of various sizes. Therefore,
The angle of view varies depending on the combination of lens and film used. On the other hand, in an electronic still camera, the size of the image sensor, which corresponds to film, is fixed, so the angle of view is determined by the focal length of the zoom lens. Therefore, by operating the zoom lens of the electronic still camera, you should be able to set the same angle of view as the large format camera, but since the electronic still camera only has a scale for the focal length value of the zoom lens, each time the lens or film of the large format camera is different, You had to perform tedious calculations to find the focal length value of the zoom lens that corresponds to the angle of view of the large format camera, or you had to adjust the zoom lens by intuition or by comparing both viewfinders.

An object of the present invention is to provide an electronic still camera that solves these problems.

Means for Solving Problems> An electronic still camera according to the present invention has a zoom lens and a zoom operation lever for changing the focal length of the zoom lens on the outer surface of the case. A scale plate holding device that removably holds a scale plate relative to the lever is provided, and the scale plate has the focal length value of the lens of the large format camera and the film size.
A feature is that one is written as a title, and the other is written with a scale indicating the position of the zoom operation lever corresponding to the angle of view determined by both.

Function: When using an electronic still camera with the above configuration together with a large format camera for simultaneous embroidery, select the scale plate with the title of the focal length value of the lens used for the large format camera or the film size, and press the scale plate. It is held in the holding device and the zoom control lever is set to the scale position of the corresponding film size or lens focal length value. This allows the angle of view to match between the large format camera and the electronic still camera.

Example of implementation The present invention will be explained together with embodiments with reference to the drawings.

FIG. 1 shows an embodiment of an electronic still camera according to the present invention, in which a zoom lens 2 is provided inside a case 1, a finder 3 is provided on the upper part of the back surface, and a zoom operation lever 4 is provided on the side surface. 5 is a focus ring, 6 is a connector for connection with the outside, and 7 is a battery storage section.

Inside the case 1, an image sensor such as a COD, a recording section, and various electronic circuits are installed. The recording section generally uses a system that magnetically records an analog image signal on a rotating floppy disk, but there are also systems that convert it into a digital image signal and record it on a RAM such as a semiconductor memory.

The zoom operation lever 4 is of a sliding type, and when the zoom operation lever 4 is moved, the zoom lens 2 is moved by the force of an actuator or directly, and the focal length is changed. In a typical electronic still camera, as shown in FIG. 9, a scale 8 for displaying a focal length value is provided on the case 1 as the original zoom display value.

In the present invention, as shown in FIG. 1, a scale plate 9 along the movement range of the zoom operation lever 4 is removably provided. The scale plate 9 will be described later.

In this embodiment, the tin plate holding device 10 is as shown in FIGS. 2 and 3.
As shown in the figure, the case 1 is recessed along the movement range of the zoom operation lever 4, and a steel plate 12 is placed on the back side of the recess 11.
The permanent magnet 13 is fixed. At least the recess 11 of the case 1 is made of a non-magnetic material such as plastic.

14 indicates the magnetization direction of the permanent magnet 13.

The scale plate 9 is made of a magnetic material and is sized to fit into the recess 11 of the case 1. Therefore, when the scale plate 9 is inserted into the recess 11, it is attracted to the permanent magnet 13 and held within the recess 11. Note that 15 is a notch for inserting a finger to remove the scale plate 9.

The scale plate 9 has a title section 16 and a zoom display section 17.

In the title section 16, one of the focal length (f) value and film size value of the lens used for the large format camera is written,
The other is indicated on the zoom display section 17 along with a scale 18 at the position of the zoom operation lever 4 corresponding to the angle of view determined by both.

Note that the scale plate holding device is not limited to the above-mentioned embodiment, and may be one that holds the scale plate with Velcro or a Kasaoka type device in the form of a transparent case.

Here, the angle of view of the electronic still camera will be explained with reference to FIGS. 4 and 5. Assuming that a 2/3-inch solid-state image pickup device is used, the image size 19 is 6.6 mm in the vertical direction and 8.8 mm in the horizontal direction, as shown in FIG. Therefore, if the focal length of the zoom lens 2 is f+nm, it is expressed as follows. In FIG. 5, 20 is a subject and 21 is an electronic still camera.

Therefore, when the film size of a large-format camera is fixed, the focal length (f) value of the lens of the large-format camera corresponding to the horizontal or vertical angle of view determined by this is displayed on the zoom display on the scale plate 9 of the electronic still camera. value.

On the other hand, if the f value of the lens of a large format camera is constant,
The film size value corresponding to the horizontal or vertical angle of view,
This is the zoom display value of the scale plate 9 of the electronic still camera.

Table 1 shows examples of the angle of view depending on the film size used in a large format camera and the f value of the lens.

Table 1 =8= Next, an example of the scale plate 9 applied to an electronic still camera having a zoom lens with a focal length range of f=12.5 to 37.5 mm and a 2.2/3-inch solid-state 1 ms lens is shown below. It is shown in FIG. 6, FIG. 7, and FIG. 8.

Incidentally, FIG. 9 shows a scale 8 representing the original f-value of the zoom lens 2. The angle of view obtained by this zoom lens 2 and the 2/3-inch solid-state image sensor is as shown in Table 2.

Table 2 The scale plate 9 shown in Figure 6 is for 4x5 film,
The lens f value of the large format camera corresponding to the horizontal angle of view is shown on the zoom display section 17.

The scale plate 9 shown in FIG. 7 is for the same 4×5 film, but the lens f value of a large format camera corresponding to the vertical angle of view is indicated on the zoom display section 17.

The scale plate 9 shown in FIG. 8 is for a lens of f=300 mm, and the film size of the large format camera corresponding to the horizontal angle of view is indicated on the zoom display section 17.

When using a large-format camera and an electronic still camera at the same time, select the scale plate 9 that corresponds to the lens and film used for the large-format camera, attach it to the scale plate holding device 10 of the electronic still camera, and press the zoom control lever 4. Align with the scale. This makes it easy to match the viewing angles of a large format camera and an electronic still camera.

Next, a method for making the shutter opportunities of a large-format camera and an electronic still camera the same will be briefly explained. In this case, if a strobe is not used, simply by linking the shutters of the two cameras, it is possible to easily take pictures at the same photo opportunity within an error of the difference in shutter operation delay. However, since it is not easy to take pictures with a strobe in a studio, the following methods (1) to (3) are used, for example. However, the strobe shall be connected and synchronized with the large-format camera, and the shutter of the large-format camera will be fully opened after the shutter of the electronic still camera is fully opened.

(1) The first method is to have a predetermined delay in the cable release of the large format camera, and then release the electronic still camera before the shutter of the large format camera is fully opened, based on the shutter release signal of the large format camera. By keeping the shutter in a valve state, the strobe light emission of the large-format camera is synchronized with the image pickup timing of the electronic still camera, and the shutter of the electronic still camera is closed after the strobe light emission to perform recording.

(2) The second method is to operate the shutter release of the large-format camera when the shutter of the electronic still camera begins to open, and to make the shutter release of the large-format camera emit light when the shutter of the large-format camera is fully open. The electronic still camera's shutter is closed after the strobe light is emitted, and the image is recorded.

(3) The third method is to generate a fully open shutter signal for a large format camera and a fully open shutter signal for an electronic still camera, and pass the two fully open shutter signals through an AND gate.
By causing a strobe to emit light based on the output signal of the AND gate, recording is performed by synchronizing the strobe light emission of the large format camera with the imaging timing of the electronic still camera.

<Effects of the Invention> According to the electronic still camera of the present invention, when used at the same time as a large-format camera, by simply attaching an appropriate scale plate and operating the zoom control lever, the electronic still camera's image can be adjusted to the field of view of the large-format camera. Corners can be easily matched.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an electronic still camera according to an embodiment of the present invention, Fig. 2 is a sectional view showing an example of a scale plate holding device, Fig. 3 is a perspective view thereof, and Fig. 4 is a 2/3 inch A diagram showing the image size of the solid-state image sensor, Figure 5 is an explanatory diagram of the angle of view, Figures 6, 7, and 8 are front views showing examples of scale plates, and Figure 9 is a conventional zoom display. It is a front view showing an example of the scale. In the drawings, 1 is a case, 2 is a zoom lens, 4 is a zoom operation lever, 9 is a scale plate, 10 is a scale plate holding device, 11 is a recessed part, 12 is an iron plate, 13 is a permanent magnet, 16 is a title part, 1
7 is a zoom display section, and 18 is a scale.

Claims (1)

[Scope of Claims] An electronic still camera having a zoom lens and a zoom operation lever for changing the focal length of the zoom lens on the outer surface of the case, the scale plate having a scale plate for the zoom operation lever removably held on the outer surface of the case. A holding device is provided, and on the scale plate, one of the focal length value of the lens of the large format camera and the film size is written as a title, and the other is a scale indicating the position of the zoom operation lever corresponding to the angle of view determined by both. An electronic still camera characterized by the following.