JP2772593B2 - Zoom camera with telescope function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom camera having a telescope function.

[0002]

2. Description of the Related Art In recent years, cameras have become multifunctional.
Not only can you take pictures, but they are also getting more features. As one of them, Japanese Patent Application No. 3-46120 filed by the present applicant proposes a device in which a part of a finder lens is moved / reversed to change an optical magnification to have a function as a telescope. ing.

[0003]

However, in the above-mentioned conventional example, a finder optical system having a telescope function is used.
When using the telescope function, the optical magnification is extremely large as compared with the case of normal shooting. That is, since the optical magnification is large, when the telescope function is used after use on the telephoto side during normal shooting, observation of the target object may be extremely difficult.

An object of the present invention is to provide a zoom camera which has good usability of a telescope function in view of the above-mentioned problems of the conventional example.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a zoom photographing optical system and a finder optical system for displaying a photographing range by the zoom photographing optical system. The system selects at least two optical magnifications of a first optical magnification for displaying a photographing range of the zoom photographing optical system and a second optical magnification for displaying a range independent of the photographing range of the photographing optical system. In a zoom camera that can be used as a target, the second optical magnification is larger than the first optical magnification, and when the second optical magnification is used, the zoom optical system is moved to the wide side.

[0006]

In the zoom camera having the above configuration, the optical magnification is extremely large when the mode is switched to the telescope mode when the zoom position at the time of normal shooting is located on the telephoto side. , So that the target can be found quickly.

[0007]

An embodiment of the present invention will be described below with reference to FIG. In FIG, 1 is a photographic lens consisting of a zoom optical system has a function for focusing light from an object to the film plane F during exposure, is driven by a zoom lens driving motor M. The light beam incident on the photographic lens 1 is reflected by the main mirror 2 except during exposure, and then passes through a condenser lens 3, a sub mirror 4, an elector lens 5, a field lens 6, and an eyepiece 7, which constitute a finder optical system. To reach the eyes of the photographer, so that the photographer can recognize the photographing range of the photographing lens 1. The center of the sub-mirror 4 is semi-transmissive. After passing through a part of the light from the photographing lens 1, the light is reflected by a distance measuring mirror 8, and then a line sensor for focus detection. 9 is incident. Reference numeral 10 denotes a microcomputer installed in the camera body (hereinafter referred to as a microcomputer).
A processing device having functions such as ROM, RAM, A / D conversion, and D / A conversion. A series of cameras such as automatic exposure control, automatic focus control, and film winding according to a sequence program stored in the ROM. Perform the operation. Reference numeral 11 denotes a drive circuit for the line sensor 9, which drives the line sensor 9 in accordance with a command from the microcomputer 10, and takes in, amplifies, and sends out the image signal obtained by the line sensor 9 to the microcomputer 10.

A part of the light reflected without passing through the sub-mirror 8 is taken out by the photometric half mirror 12 provided between the field lens 6 and the eyepiece 7 and enters the photometric sensor 13. Then, the output signal of the photometric sensor 13 is transmitted to the microcomputer 10, and the automatic exposure control (A
E). SW1 and SW2 are switches interlocked with a release button (not shown), which are connected to the microcomputer 10, respectively. The switch SW1 is closed by the first step of depression of the release button, and subsequently the second step of depression. The switch SW2 is closed. Then, as will be described later, the microcomputer 10 starts the photometry and the automatic focus adjustment operation in response to the closing of the switch SW1, and performs various operations necessary for exposure and the film winding operation triggered by the closing of the switch SW2. . Reference numeral 14 denotes a lens shutter that also functions as an aperture, and performs an exposure operation according to a command from the microcomputer 10.

In addition, the erector lens 5 is moved from a first position indicated by a solid line in FIG.
As a result, the optical magnification of the finder optical system is dramatically increased, and the entire finder optical system functions as a telescope. Switch 1
Reference numerals 5 and 16 denote switches for detecting the normal photographing mode state and the telescope mode state, respectively. The switch 15 is closed when the elector lens 5 is in the normal photographing position, and is open at other times. And the microcomputer 10
Monitors whether the switches 15 and 16 are each closed. As described above, at the second position 5 'of the elector lens 5, the entire finder optical system functions as a telescope, and its main purpose is to observe a subject. In this embodiment having the above-described configuration, when the erector lens 5 moves from the position shown by the solid line in the drawing to the second position 5 'shown by the broken line in response to the operation of the photographer, the switch 16 is closed and the zoom lens is closed. the driving motor M so transferred the photographic lens 1 to the wide side, since when switching the finder optical system from the normal imaging telescope function usage state becomes the zoom position of the photographic lens 1 to the wide side, quickly find a target object can do. If the magnification is insufficient when using the telescope function, the zoom position of the photographing lens 1 may be moved to the telephoto side.

[0010]

According to the present invention, as described above, the zoom position of the zoom photographing optical system is moved to the wide side when the viewfinder optical system is switched from the normal photographing to the use state of the telescope function having a large optical magnification. Thus, the object to be observed can be easily found.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a zoom camera with a telescope function according to an embodiment of the present invention.

[Explanation of symbols]

1. Zoom lens, 2. Main mirror, 4.
Sub-mirror, 5 · Electa lens, 6 · Field lens, 7 · Eye lens, 8 · Ranging mirror, 9 ·
· Focus detection line sensor, 10 · · microcomputer, 11 · · focus detection line sensor drive circuit, 13
.. A photometric sensor, 14... A lens shutter, 15... A normal shooting mode detection switch, 16... A telescope mode detection switch.

Claims (1)

(57) [Claims] 1. A zoom optical system comprising: a zoom photographing optical system; and a finder optical system for displaying a photographing range of the zoom photographing optical system, wherein the finder optical system displays a photographing range of the zoom photographing optical system. In a zoom camera capable of selectively taking at least two optical magnifications of one optical magnification and a second optical magnification displaying a range independent of the photographing range of the photographing optical system, a second optical magnification Is a zoom camera with a telescope function, wherein the zoom optical system is moved to the wide side when the second optical magnification is used and the second optical magnification is used.