JP2003161983A - Range finder interlocked type camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a range finder interlocking type camera realizing stable focusing by informing a user of the aligned state of the image of a subject by visual judgement or according to a signal. <P>SOLUTION: This camera includes a reference image optical system 160 for forming the reference image of the subject by transmitting part of luminous flux from the subject passing through a finder principal optical system 130, and a measured image optical system 170 for forming the measured image of the subject by transmitting part of luminous flux form the subject passing through a range finder optical system 140. A focus arithmetic operation part 182 detects the blur degree of the image of the subject based on a signal concerning the image of the subject outputted from a reference image detecting sensor 166 and a signal concerning the image of the subject outputted from a measured image detecting sensor 168. Output parts 174 and 176 output the detected result on the blur degree of the image of the subject based on a signal concerning the detected result on the blur degree of the image of the subject outputted from the arithmetic operation part 182. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rangefinder interlocking camera including a double image matching rangefinder. In particular, the present invention relates to a rangefinder interlocking camera capable of outputting various signals to notify the user of the matching state of images of a subject.

[0002]

2. Description of the Related Art Referring to FIG. 13, a conventional rangefinder interlocking camera is provided with a finder 720 including, for example, a double image matching type rangefinder. Finder 7
20 includes a finder optical system 728. The viewfinder optical system 728 is used for shooting the subject, that is, the subject 7.
Finder main optical system 73 for forming the image of 26
0, and a rangefinder optical system 740 for the purpose of measuring the distance (hereinafter referred to as “subject distance”) from the camera to the subject 726 (hereinafter referred to as “distance measurement”). The finder main optical system 730 includes an optical axis 730x, a finder objective lens 732, a beam splitter 734, a semi-transmissive film surface 734h, and an eyepiece lens 736. Subject 72
The light flux from 6 passes through the viewfinder objective lens 732, the beam splitter 734 and the semi-transmissive film surface 734h, and the eyepiece lens 736, and as shown in FIG. 14, an image of the subject (hereinafter referred to as “subject image”) 726m. It is configured to form an image (indicated by a thick line) in the field of view of the finder frame 728f.

On the other hand, the rangefinder optical system 740 has an optical axis 740.
x and a movable mirror 742 for declination that is rotatable with respect to the optical axis
And a measurement objective lens 74 that is movable in the direction perpendicular to the optical axis.
Including 4 and. The light beam from the subject 726 is reflected by the deflection angle movable mirror 742, passes through the measurement objective lens 744, and
The semi-transmissive film surface 734h is reflected, passes through the eyepiece lens 736, and as shown in FIG. 14, a subject image 726f (shown by a chain double-dashed line) is formed in a portion within the field of view of the finder frame 728f. ing. That is, the finder optical system 728 forms a subject image 726m from the optical path of the finder main optical system 730 and a subject image 726f from the optical path of the rangefinder optical system 740 in the field of view of the finder frame 728f. It is configured.

Here, the baseline length of the finder 720 (the optical axis 730x parallel to the light flux from the subject 726 and the optical axis 74)
(Distance to 0x) is shown by KSL in FIG.

Further, the rangefinder interlocking camera incorporates a mechanism for moving the subject image 726f within the field of view of the finder frame 728f by the rangefinder optical system 740 so as to be linked to the amount of movement of the taking lens. .

A subject 726 using a rangefinder interlocking camera
A user (hereinafter, simply referred to as “user”) 72
Reference numeral 4 indicates the degree of overlap between the subject image 726m from the optical path of the finder main optical system 730 and the subject image 726f from the optical path of the rangefinder optical system 740.
It is used as a guide for focusing the subject image (optimizing the extension position of the lens) by visually observing through the eyepiece lens 736 provided on the. That is, user 7
24 confirms the "focused state" by visually recognizing the state in which the subject image 726m from the optical path of the finder main optical system 730 and the subject image 726f from the optical path of the rangefinder optical system 740 overlap. , Subject 726
The camera can be focused on.

[0007]

However, the conventional camera has the following problems. (1) In a conventional rangefinder interlocking camera, since the coincidence of double images is visually recognized, the measurement accuracy of distance measurement depends on the degree of incompatibility between the user's own eyes and the eyepiece diopter, and the brightness of the subject. However, it is difficult to perform consistent recognition of double images because it is significantly affected by the environment of the subject at the time of shooting and the individual difference of the user, such as the state of visual acuity due to the physical condition of the user. (2) In a conventional rangefinder interlocking camera, there is a limit to the visual judgment ability (eye resolution) of the user. Therefore, in order to improve the measurement accuracy of distance measurement, it is necessary to increase the effective base line length of the finder (base line length × magnification of the finder). Therefore, the viewfinder optical system becomes large and the camera itself becomes large. As a result, the portability and maneuverability, which are the features of the rangefinder-linked camera, may be impaired. (3) In the conventional rangefinder interlocking camera, it is difficult for a user whose visual acuity has deteriorated due to aging or the like to recognize the matching state of the subject images, and it is difficult to focus the camera. . (4) In the conventional rangefinder interlocking type camera, since the subject image from the optical path of the finder main optical system and the subject image from the optical path of the rangefinder optical system are virtual images or aerial images, it corresponds to the size of the subject distance. Then, the position of the optical subject image in the viewfinder changes. Therefore, for a user who has a weak diopter adjustment capability, there is a subject distance at which the subject image is difficult to see, and it is difficult to focus the camera. For example, such a user may easily see a subject at a long distance, but may be difficult to see a subject at a short distance, and the measurement accuracy of distance measurement may be deteriorated. (5) In the conventional rangefinder interlocking type camera, the subject image from the optical path of the finder main optical system and the subject image from the optical path of the rangefinder optical system are virtual images or aerial images, so the eye of the user looking into the finder Depending on the position (optical axis of the eyepiece), the position of the optical image of the subject in the viewfinder field changes according to the size of the subject distance. Therefore, it is difficult to recognize the matching state of the subject images. (6) Generally, the viewfinder of the single-lens reflex camera projects the subject image on the matte surface of the focusing screen, so that the degree of blurring of the subject image can be visually confirmed. On the other hand, in a rangefinder interlocking camera equipped with a double image matching rangefinder, the user is observing a virtual image or an aerial image in the viewfinder, and therefore cannot know the degree of blurring of the subject image. For this reason, in the rangefinder interlocking type camera provided with the double image matching type rangefinder, there is a possibility that a technical limitation occurs in the shooting expression.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rangefinder interlocking camera equipped with a double image-matching rangefinder from a subject image from the optical path of the finder main optical system in the finder and from the optical path of the rangefinder optical system. Distance measurement by not only the user's visual judgment of the matching state of the subject image, but also by outputting various signals (visual expression, auditory expression, etc.) to inform the user of the matching state of the subject image. The objective is to provide a rangefinder interlocking camera that provides a sense of security and enables stable focusing.

Another object of the present invention is to provide a rangefinder interlocking camera capable of notifying a user of the degree of blurring of a subject image by outputting various signals (visual expression, auditory expression, etc.). To do.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a finder main optical system for forming an image of a subject and an object image of the subject by the finder main optical system for measuring a subject distance are provided. In a rangefinder interlocking camera equipped with a rangefinder optical system for forming a partial image, a part of the light flux from the subject passing through the viewfinder main optical system is transmitted to serve as a reference for measuring the subject distance. By transmitting a part of the light flux from the subject that passes through the reference image optical system for forming the reference image of the subject and the rangefinder optical system,
And a measurement image optical system for forming a measurement image of the subject for measuring the subject distance. The camera of the present invention further receives a light flux from a subject passing through the reference image optical system to detect a reference image of the subject, and a light flux from the subject passing through the measurement image optical system. The measurement image detection sensor for detecting the amount of deviation of the measurement image of the subject with respect to the reference image of the subject, the signal related to the image of the subject output by the reference image detection sensor, and the subject output by the measurement image detection sensor. Based on the signal relating to the image of the subject, the focus calculation unit for detecting the degree of blurring of the image of the subject, and the signal relating to the detection result of the degree of blurring of the image of the subject output by the focus calculation unit, And an output unit for outputting the detection result of the blur degree.

In the camera of the present invention, the finder main optical system includes a finder objective lens for diffusing the light flux from the subject, and the first semi-transmissive film surface is provided on the finder objective lens. The surface is configured to pass a part of the light flux from the subject incident on the finder objective lens and reflect a part of the light flux.
The light flux reflected by the first semi-transmissive film surface is preferably configured to enter the reference image detection sensor.

Further, in the camera of the present invention, the rangefinder optical system includes a semi-transmissive mirror for passing a part of the light beam from the subject and reflecting a part of the light beam, and is reflected by the semi-transmissive mirror. The formed light flux is preferably configured to be incident on the measurement image detection sensor.

Further, according to the present invention, in a rangefinder interlocking type camera, a part of a light flux from a subject passing through a viewfinder main optical system is transmitted to form a reference image of the subject serving as a reference for measuring the subject distance. A reference image optical system for
A part of the light flux from the subject that passes through the rangefinder optical system is transmitted, and a measurement image optical system for forming a measurement image of the subject for measuring the subject distance and a subject through the reference image optical system It receives the light flux, detects the reference image of the subject, and receives the light flux from the subject that passes through the measurement image optical system,
An image detection sensor for detecting the measurement image of the subject, and an image detection sensor for detecting the relationship between the reference image of the subject and the measurement image of the subject, and a signal related to the image of the subject output by the image detection sensor,
To output the detection result of the degree of blur of the image of the subject based on the focus calculation unit for detecting the degree of blur of the image of the subject and the signal regarding the detection result of the degree of blur of the image of the subject output from the focus calculation unit And an output section of

In the camera of the present invention, the viewfinder main optical system includes a viewfinder objective lens for diffusing the light flux from the subject, and the first semi-transmissive film surface is provided on the viewfinder objective lens to provide the first semi-transmission. The film surface is configured to pass a part of the light beam from the subject incident on the finder objective lens and to reflect a part of the light beam. The light beam reflected by the first semi-transmissive film surface detects the image. It is preferably configured to be incident on the sensor.

In the camera of the present invention, the rangefinder optical system includes a semi-transmissive mirror for passing a part of the light beam from the subject and reflecting a part of the light beam, and is reflected by the semi-transmissive mirror. The luminous flux is preferably configured to be incident on the image detection sensor.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (1) First Embodiment (1.1) Structure of Camera Now, in the first embodiment of the camera of the present invention, the overall structure of the camera will be described.

Referring to FIGS. 2 and 3, a rangefinder interlocking type camera 100 of the present invention comprises a camera body 102 and a taking lens 104. The taking lens 104 is detachably attached to the camera body 102. For example, the bayonet mounting portion of the taking lens 104 can be fitted to the bayonet mount portion of the camera body 102, and the taking lens 104 can be rotated with respect to the camera body 102 to attach the taking lens 104 to the camera body 102. As a modified example, the structure may be such that the taking lens 104 is fixed to the camera body 102.

The taking lens 104 is the taking lens optical axis 104.
x, the taking lens optical system 106, and the distance adjusting mechanism 108
And an aperture adjustment mechanism 110.

A shutter button 102b is provided on the upper surface of the grip portion 102g of the camera body 102. The shutter speed setting dial 102d is the camera body 102.
Is provided on the upper surface of. A winding lever 102v for winding the film 112 is provided on the upper surface of the camera body 102. The shutter speed is controlled electronically. A crystal oscillator 114 that constitutes a source oscillation for controlling the shutter speed, an IC 116 including a control unit for controlling the shutter speed, and a battery 118 that constitutes a power supply.
And are built into the camera body 102. As a modification,
The control of the shutter speed may be mechanical, or mechanical and electronic. In this configuration, the battery 1
The crystal oscillator 114 and the IC 116 can be operated by 18 to control the shutter speed.

A lens shutter (not shown) is provided on the taking lens 104. As a modified example, the camera of the present invention includes a focal plane shutter and a camera body 10.
The structure built in 2 may be sufficient. As a modified example, the camera of the present invention may be configured such that a film feeding motor is built in the camera body 102 and the film 112 is automatically fed.

A power switch 102c for controlling on / off of the operation of the camera 100 is provided in the camera body 102. The camera body 102 is provided with a mode setting switch 102m for setting the distance measurement mode.
The distance measurement modes include a "manual" mode (indicated by the symbol "M") in which the user can visually determine the matching state of the subject image, and a "focus aid" that notifies the user of the matching state of the subject image by various signals. Mode (symbol “FA”
Indicated by) and.

The power switch 102c and the mode setting switch 102m may be rotary switches, slide switches, push switches, or touch sensor switches. Good.

The camera body 102 is provided with a viewfinder 120 including a double image matching type rangefinder, a daylighting window 120b, and a rangefinder window 120c. (1.2) Structure of Viewfinder Referring to FIG. 1, the viewfinder 120 includes a viewfinder optical system 128. The finder optical system 128 forms a viewfinder main optical system 130 for forming an image of the subject 126 and the subject view optical system 130 for measuring (distance measuring) the subject distance so as to overlap the subject image. And a rangefinder optical system 140 for forming a partial image.

The finder main optical system 130 includes an optical axis 130x of the main optical system, a finder objective lens 132 for diffusing the light flux from the object 126, a beam splitter 134 for injecting the light flux from the finder objective lens 132, and a beam. Eyepiece 1 for converging the light flux from the splitter 134 and enlarging the image of the subject 126
36 and.

The first semi-transmissive film surface 132h is provided on the finder objective lens 132. First semi-permeable membrane surface 132
h is configured to pass a part of the light flux from the subject 126 that enters the finder objective lens 132 and reflect a part of this light flux. Second semi-permeable membrane surface 134h
Are provided in the beam splitter 134. The second semi-transmissive film surface 134h is configured to pass the light flux from the finder objective lens 132 and reflect the light flux incident from the direction perpendicular to the light flux.

The light flux from the subject 126 is the finder objective lens 132, the beam splitter 134 and the second
Through the semi-permeable membrane surface 134h and the eyepiece lens 136,
As shown in FIG. 6, the subject image 126m (shown by a thick line) is formed within the field of view of the finder frame 128f.

The rangefinder optical system 140 includes a rangefinder window 120c.
, The rangefinder optical optical axis 140x, the rangefinder pentagonal roof prism 142 for changing the path of the light flux from the subject 126, the rangefinder optical optical axis 140x movable in the vertical direction, and the rangefinder pentagonal A movable objective lens for deviation angle 144 for converging the light beam from the Rudach prism 142, and a semi-transmission for passing a part of the light beam from the movable objective lens for deviation angle 144 and reflecting a part of this light beam. The mirror 146, the rangefinder image mask 148 for blocking a part of the light flux from the semi-transmissive mirror 146, the beam splitter 134 and the second semi-transmissive film surface 134h.
And the eyepiece lens 136.

The light beam from the subject 126 has its path changed by the rangefinder pentagonal roof prism 142, passes through the movable objective lens for deviation angle 144 and the semi-transmissive mirror 146, passes through the rangefinder image mask 148, and then the second beam. Semi-permeable membrane surface 1
It is configured to reflect at 34h, pass through the eyepiece lens 136, and form a subject image 126f (shown by a chain double-dashed line) in a portion within the field of view of the finder frame 128f, as shown in FIG. That is, the finder optical system 128
Is a subject image 126 m from the optical path of the finder main optical system 130 and a subject image 1 from the optical path of the rangefinder optical system 140.
26f and 26f are combined in the field of view of the finder frame 128f to form an image.

The viewfinder 120 is provided with a field frame mask 150 for providing a field frame within the field of viewfinder frame 128f, and a mask reflecting mirror 152 for reflecting the light flux passing through the field frame mask 150. The light flux passing through the field frame mask 150 is reflected by the mask reflecting mirror 15.
The light is reflected by 2 and reflected by the second semi-transmissive film surface 134h, and passes through the eyepiece lens 136. Therefore, as shown in FIG. 6, the image 150 m of the field frame mask 150 is displayed on the viewfinder frame 12.
It is configured to form an image within the field of view of 8f. The field frame mask 150 has a field frame optical axis 150x located in the daylighting window 120b.

In the camera 100, the object image 126f by the rangefinder optical system 140 is moved in association with the movement of the taking lens optical system 106 so as to correspond to the operation of the distance adjusting mechanism 108 of the taking lens 104. An objective lens moving mechanism (not shown) for moving the declination movable objective lens 144 is incorporated.

The user 124 of the camera 100 operates the distance adjusting mechanism 108 to determine the degree of overlap between the subject image 126m from the optical path of the finder main optical system 130 and the subject image 126f from the optical path of the rangefinder optical system 140. By visually observing through the eyepiece lens 136 provided in the finder main optical system 130, the camera 100 can be focused on the subject 126.

The finder 120 further branches the light flux from the subject 126 that has passed through a part of the finder main optical system 130, and serves as a reference for measuring the subject distance for measuring (distance measuring) the subject distance. A reference image optical system 160 for forming a reference image of the subject 126 and a light flux from the subject 126 that has passed through a part of the rangefinder optical system 140 are branched to measure the subject distance (ranging). , A measurement image optical system 170 for forming a measurement image of the subject 126
Including and

The reference image optical system 160 includes the first semi-transmissive film surface 132h and the reference image pentagonal roof prism 16 for changing the path of the light flux from the first semi-transmissive film surface 132h.
2 and a reference image imaging lens 164 for converging the light flux from the reference image pentagonal roof prism 162 to form an image of the subject 126.

The measurement image optical system 170 is the semi-transmissive mirror 146.
including.

A reference image detection sensor 166 for receiving the light flux from the object 126 incident from the reference image optical system 160 to detect an image of the object, and an object 126 incident from the measurement image optical system 170. The measurement image detection sensor 168 for receiving the light flux and detecting the amount of deviation of the measurement image of the subject from the reference image of the subject is included in the finder 120.
It is provided in.

The light flux from the subject 126 in the finder main optical system 130 is reflected by the first semi-transmissive film surface 132h, the path of the light flux is changed by the reference image pentagonal roof prism 162, and passes through the reference image forming lens 164. , A reference subject image is formed on the reference image detection sensor 166. Subject 1 in rangefinder optical system 140
The light flux from 26 is a rangefinder pentagonal roof prism 1
The path of the light beam is changed by 42, and the movable objective lens 1 for declination
The object image for distance measurement is formed on the measurement image detection sensor 168 after passing through 44 and reflected by the semitransparent mirror 146.

With this configuration, the visual observation of the subject 126 and the reference image detection sensor 166 and the measurement image detection sensor 1 are performed.
The parallax between the detection of the object 126 by the 68 can be eliminated.

The reference image detection sensor 166 and the measurement image detection sensor 168 operate when the mode setting switch 102m is operated to set the distance measurement mode to the "sensor operation mode", that is, "focus aid", and the distance measurement is performed. When the mode is set to "sensor non-operation mode", that is, "manual", it is configured not to operate.

The reference image detection sensor 166 and the measurement image detection sensor 168 are preferably area sensors composed of CCD or the like. Alternatively, the reference image detection sensor 166 and the measurement image detection sensor 168 may be line sensors.

It is preferable that the IC 116 be provided with a focus detection unit having a function of processing information related to the image of the subject detected by the reference image detection sensor 166 and the measurement image detection sensor 168 and outputting a signal related to the calculation result. Alternatively,
The IC having the focus detection unit may be provided separately from the IC 116. The crystal oscillator 114 constitutes a source oscillator that outputs a reference signal for calculation processing in the IC 116.
The battery is a reference image detection sensor 166, a measurement image detection sensor 16
8 to operate the IC 1116 to form a power source.

Referring to FIG. 6, a display unit 174 is provided on the finder 120. The display unit 174 includes a shooting condition display unit 174a for displaying the set shutter speed and aperture value, a distance measurement mode display unit 174m for displaying the distance measurement mode, and a result of distance measurement of the image of the subject. That is, it includes a detection result display unit 174f for displaying the focus detection result. Characters indicating the set shutter speed "1/250" and characters indicating the set aperture value "5.6" are displayed on the photographing condition display portion 174a outside the field of view of the viewfinder. Display unit 174
Is composed of a display element such as an LED. The display unit 174 may be composed of an LCD. The user is configured to be able to magnify and view the display content displayed by the display unit 174 by the eyepiece lens 136.

Referring to FIG. 3, a sound producing section 176 is provided in the camera body 102 for producing a sound based on the result of distance measurement of the image of the subject. (1.3) Configuration of Focus Detection Unit Next, the configuration of the focus detection unit will be described.

With reference to FIG. 4, as described above, the reference image detection sensor 166 is configured to receive the light flux from the subject passing through the reference image optical system 160 and detect the image of the subject. The measurement image detection sensor 168 is configured to receive the light flux from the subject passing through the measurement image optical system 170 and detect the image of the subject.

The focus detection unit 180 determines whether the distance measurement mode is "manual" or "focus aid", and when it is "focus aid", the reference image detection sensor 166 and the measurement image detection sensor are detected. 168 for operating the mode control unit 168, and the image of the subject output by the reference image detection sensor 166 in response to the signal output by the mode control unit 178 when the distance measurement mode is “focus aid”. And a focus calculation unit 182 for detecting the focus of the image of the subject based on the signal relating to the image of the subject output from the measurement image detection sensor 168. A mode display unit 174m for displaying the set distance measurement mode is provided in a part of the display unit 174 (see FIG. 6).

Shooting condition storage for storing shooting conditions such as the focal length of the shooting lens 104, the set aperture value, the set shooting distance value, and the shooting screen size set in the camera body 102. A section 192 is provided. With this configuration, the taking lens 104 can store the focal length, the value of the open aperture (open F value), and the like.
The OM and the RAM that can store the set aperture value and the set shooting distance value are provided.
The information stored in the OM and RAM is the camera body 1
It is preferable to be configured so that the information can be input to the shooting condition storage unit 192 after being transmitted to the server 02.

As a modification, the focal length of the taking lens 104, the set aperture value, and the set taking distance value are transmitted to the camera body 102 via a signal pin provided on the taking lens 104. The shooting condition storage unit 1
You may input so that it may be input into 92.

An arithmetic expression storage unit 184 that stores the arithmetic expression and data for detecting the focus of the image of the subject and the depth of field of the taking lens 104 according to the photographing condition for photographing the subject is provided in the focus detection unit 180. It is provided. The arithmetic expression for detecting the focus of the image of the subject is obtained in advance by theoretical analysis and / or experiment with the focal length of the taking lens 104, the value of the set aperture, the value of the set shooting distance, and the like. It is decided to use the data to numerically calculate the degree of blurring of the image of the subject.

The calculation result of the degree of blur is, for example, two stages (large blur, small blur), three stages (large blur,
Medium blur, small blur, 5 levels (large blur,
It can be set to allow stepwise display such as slightly large blur, medium blur, slightly small blur, and small blur). That is, the focus calculation unit 182 is configured to calculate the degree of focus shift according to the shooting conditions for shooting the subject, that is, the “blurring degree”.

In this way, the focus calculation section 182 can detect the degree of blurring of the image of the subject using the calculation formulas and data stored in the calculation formula storage section 184.

The output control unit 186 and the output control unit 186 for outputting the detection result of the blur degree of the image of the subject based on the signal output from the focus calculation unit 182 regarding the detection result of the blur degree of the subject image. A display drive unit 18 for inputting an output signal to be output and operating the display unit 174.
8 and a sound generation drive unit 190 for operating the sound generation unit 176 by inputting the output signal output from the output control unit 186 is provided in the focus detection unit 180.

For example, the sound producing unit 176 may be configured with a buzzer or a speaker. For example, the pronunciation unit 176 is
The focus calculation unit 182 is configured to emit a sound when the focus detection result of the image of the subject is in focus.
Alternatively, the sound producing unit 176 makes a low sound when the detection result of the degree of blurring of the image of the subject calculated by the focus calculating unit 182 is so-called “front pinning”, and the image of the subject calculated by the focus calculating unit 182 is displayed. When the detection result of the degree of blurring is so-called “rear focus”, a high sound is emitted and the focus calculation unit 18
A sound with an intermediate frequency may be generated when the detection result of the degree of blurring of the image of the subject calculated by 2 is in focus.

As a modified example, the display drive unit 188 and the detection result display unit 174f may not be provided, or the sound generation drive unit 190 and the sound generation unit 176 may not be provided.

By operating the mode setting switch 102m or the output mode setting switch provided separately from the mode setting switch 102m, the detection result display unit 1
It is possible to set an output mode that operates only 74f, set an output mode that operates only the sounding unit 176, and operate both detection result display unit 174f and sounding unit 176. The output mode may be set.

In the embodiment of the camera of the present invention,
It is preferable that the circuits that perform various functions be configured in the IC 116. A CPU, ROM, RAM, etc. are provided in the IC 116. A mode control unit 178, a focus detection unit 180,
Focus calculation unit 182, calculation formula storage unit 184, output control unit 1
86, the display drive unit 188, the sound generation drive unit 190, and the shooting condition storage unit 192 are preferably configured in the IC 116.

Alternatively, the arithmetic expression storage unit 184 is the IC 11
External ROM and / or external RA provided separately from
It can also be configured to be stored in M or the like.

The IC 116 may be a PLA-IC containing programs for performing various operations. In the embodiment of the camera of the present invention, the IC 116 is used as necessary.
In addition, external elements such as resistors, capacitors, coils, diodes, and transistors can be used. (1.4) Operation of First Embodiment Referring to FIGS. 1 to 4, the light flux from the subject 126 is incident on the viewfinder objective lens 132 as it is on the optical axis 130x of the main optical system. A part of the light flux from the subject 126 that has entered the finder objective lens 132 enters the eyepiece lens 136 through the beam splitter 134. Through the eyepiece 136, the subject image 126m
(Indicated by a thick line in FIG. 6) is formed as a virtual image in the field of view of the finder frame 128f.

The other part of the light flux from the object 126 incident on the viewfinder objective lens 132 is reflected by the first semi-transmissive film surface 132h, and the path of the light flux is changed by the reference image pentagonal roof prism 162. The light flux from the reference image pentagonal roof prism 162 forms a subject image on the reference image detection sensor 166 via the reference image forming lens 164.

On the other hand, the light flux from the subject 126 is incident on the rangefinder pentagonal roof prism 142 as it is on the rangefinder optical optical axis 140x, the path of the light flux is changed by the rangefinder pentagonal roof prism 142, and the deflection angle is changed. Incident on the movable objective lens 144.

When the user 124 operates the distance adjusting mechanism 108, the objective lens moving mechanism operates in conjunction with the distance adjusting mechanism 108 of the taking lens 104, and the movable objective lens 144 for declination is perpendicular to the optical axis. Move in the direction. Therefore, the subject image 126f by the rangefinder optical system 140 also moves in the direction perpendicular to the optical axis. A part of the light beam from the movable objective lens 144 for declination passes through the semi-transmissive mirror 146, is reflected by the second semi-transmissive film surface 134h, and enters the eyepiece lens 136. With the eyepiece lens 136, the subject image 126f
The image (indicated by the one-dot chain line in FIG. 6) is formed as a real image in a part of the field of view of the finder frame 128f.

The rangefinder image mask 148 includes a semi-transparent mirror 14.
Part of the light flux from 6 is blocked. The other part of the light flux from the movable objective lens 144 for declination is reflected by the semi-transmissive mirror 146, and a subject image for distance measurement is formed on the measurement image detection sensor 168.

The light flux that has passed through the field frame mask 150 on the field frame optical axis 150x is reflected by the mask reflection mirror 152, is reflected by the second semi-transmissive film surface 134h, and passes through the eyepiece lens 136. Therefore, as shown in FIG. 6, the image 150m of the field frame mask 150 is formed within the field of viewfinder frame 128f. Field frame mask 15
0 has the field frame optical axis 150x located in the daylighting window 120b.

The user 124 is the finder main optical system 1
Object image 126m from the optical path of 30 and rangefinder optical system 14
The degree of overlap of the subject images 126f from the optical path of 0 is determined by the eyepiece lens 136 provided in the finder main optical system 130.
The camera 100 is focused on the subject 126 by visually observing through.

When the mode setting switch 102m is operated to set the focus detection mode to "focus aid", the mode controller 178 operates the reference image detection sensor 166 and the measurement image detection sensor 168. Then, the reference image detection sensor 166 receives the light flux from the subject 126 incident from the reference image optical system 160 and outputs a signal for detecting the image of the subject to the focus calculation unit 182.

When the user 124 sets the distance measuring mode to "focus aid" and operates the distance adjusting mechanism 108,
The movable objective lens 144 for declination moves, and the image of the subject on the measurement image detection sensor 168 moves. The measurement image detection sensor 168 detects the subject 1 incident from the measurement image optical system 170.
The light flux from the light source 26 is received, and a signal for detecting the image of the subject is output to the focus calculation unit 182.

When the user 124 sets the distance measuring mode to "focus aid", the mode display portion 174m displays the distance measuring mode. Referring to FIG. 6, when the focus detection mode is set to "focus aid", "FA" is displayed on the mode display portion 174m. On the other hand, when the distance measuring mode is set to "manual", "M" is displayed on the mode display portion 174m (shown by the dotted line in FIG. 6).

When the focus detection mode is "focus aid", the focus calculation unit 182 uses the calculation formula and data stored in the calculation formula storage unit 184, and the subject stored in the calculation formula storage unit 184. The degree of blurring of the image of the subject is detected according to the shooting conditions for shooting. That is,
The focus calculator 182 calculates the degree of focus shift according to the shooting conditions for shooting the subject.

The output control unit 186 outputs the detection result of the degree of blur of the image of the subject based on the signal output from the focus calculation unit 182 regarding the detection result of the degree of blur of the subject image. The display driving unit 188 inputs the output signal output by the output control unit 186 and operates the display unit 174. Figure 6
As shown in, the detection result display unit 174f displays the detection result of the focus of the image of the subject by combining symbols such as circles and triangles.

Referring to FIG. 6, the detection result display section 174.
f is a horizontal reference line 174f1, isosceles triangles 174f2 and 174f3 whose vertices facing each other are lateral,
Isosceles triangles 174f4, 174f5 with vertices pointing up
And an isosceles triangle 174f6, 174f with a downward facing vertex
7, isosceles triangle 174f2 and isosceles triangle 174f
3 and a circle 174f8 disposed between the two. For example,
Reference line 174f1 and isosceles triangles 174f2, 174
f3 is formed by printing on the display unit 174f. The isosceles triangles 174f4, 174f5 and the isosceles triangles 174f6, 174f7 are formed by red LEDs. Circle 174f8 is formed by a green LED.

Referring to FIG. 7A, the image formation position of the image of the object 126 is determined by the measurement image detection sensor 168.
When the position is closer to 6 (for example, when the distance error is 30% or more), an isosceles triangle 174f4, 174
f5 lights up. Referring to FIG. 7B, the subject 12
When the image forming position of the image 6 is much closer to the object 126 than the measurement image detecting sensor 168 (for example, when the distance error is 2% or more and less than 30%), the isosceles triangle 1
74f5 lights up. Referring to FIG. 7D, when the image forming position of the image of the subject 126 is located farther from the subject 126 than the measurement image detection sensor 168 (for example, when the distance error is 30% or more), two Equilateral triangle 174f
6 lights up. Referring to FIG. 7E, the subject 126
The image formation position of the image of
When the position is a little farther than 26 (for example, when the distance error is 2% or more and less than 30%), the isosceles triangle 17
4f6 and 174f7 are turned on. Referring to FIG. 7C, when the image is in focus (when the image is in the matching state, for example, when the distance error is less than 2%), the circle 174f8 is turned on.

Further, the sound generation driving section 190 includes the output control section 1
The output signal output by 86 is input to operate the sounding unit 176.

Next, the operation of the focus calculator 182 will be described.

Referring to FIG. 5, FIG. 5A and FIG.
The signal waveforms shown in (c) and FIG. 5 (e) show the output when the reference image detection sensor 166 is a line sensor.
The signal waveforms shown in (b), FIG. 5 (d), and FIG. 5 (f) show the output when the measurement image detection sensor 168 is a line sensor. Alternatively, when the reference image detection sensor 166 and the measurement image detection sensor 168 are area sensors, the respective signal waveforms shown in FIGS. 5A to 5F represent the output of one line in each area sensor. Shows.

FIG. 5A schematically shows the shape of the signal output from the reference image detection sensor 166 when the image formation position of the object 126 is closer to the subject 126 than the measurement image detection sensor 168. FIG. FIG. 5B is a diagram schematically showing the shape of the signal output from the measurement image detection sensor 168 when the image formation position of the image of the subject 126 is closer to the subject 126 than the measurement image detection sensor 168. is there. FIG. 5C is a diagram schematically showing the shape of the signal output from the reference image detection sensor 166 when the image forming position of the image of the subject 126 is farther from the measurement object detection sensor 168 than the subject 126. is there. FIG. 5D is a diagram schematically showing the shape of the signal output from the measurement image detection sensor 168 when the image formation position of the image of the subject 126 is farther from the measurement object detection sensor 168 than the subject 126. is there. FIG. 5E shows that when the image is in focus (when it is in the matching state, for example, when the distance error is less than 2%),
It is a figure which shows typically the shape of the signal output from the reference image detection sensor 166. FIG. 5 (f) shows that the focus is in focus (when the focus is in the match state, for example, the distance error is 2
(When less than%), it is a diagram schematically showing the shape of the signal output from the measurement image detection sensor 168. Here, FIG.
The shape of the signal shown in FIG. 5A, the shape of the signal shown in FIG. 5C, and the shape of the signal shown in FIG.

In FIG. 5, the measurement reference line STL of the reference image detection sensor 166 and the measurement reference line RLS of the measurement image detection sensor 168 are predetermined as design values of the camera of the present invention. Therefore, the focus calculation unit 182 stores in advance the value of the position of the measurement reference line STL and the value of the position of the measurement reference line RLS.

As shown in FIGS. 5A and 5B, when the image formation position of the image of the object 126 is closer to the object 126 than the measurement image detection sensor 168, the focus calculation section 18 is used.
2 recognizes the waveform 166a as a reference waveform and calculates the amount of positional deviation (phase difference) DJN between the measurement line MLB and the measurement reference line RLS of the waveform 168b corresponding to the measurement reference line STL to obtain the image of the subject. Calculate the focus of.

Further, as shown in FIGS. 5 (c) and 5 (d), the image formation position of the image of the object 126 is measured by the measurement image detecting sensor 1.
If the focus calculation unit 182 recognizes the waveform 166c as the reference waveform when the position is farther from the subject 126 than the object 68, the measurement line MLD having the waveform 168d corresponding to the measurement reference line STL.
Displacement amount (phase difference) DJ between the measurement reference line RLS and the measurement reference line RLS
By calculating A, the focus of the image of the subject is calculated.

Further, as shown in FIGS. 5 (e) and 5 (f), when the image is in focus (in the matching state, for example, when the distance error is less than 2%), the focus calculation unit 18
2 recognizes the waveform 166e as a reference waveform, and if the positional deviation amount (phase difference) between the measurement line MLD and the measurement reference line RLS of the waveform 168f corresponding to the measurement reference line STL is less than or equal to a predetermined threshold value. At some time (for example, when the pitch of the elements forming the measurement image detection sensor 168 is 1 pitch or less), it is detected that the object is in focus. (1.5) Modification of First Embodiment Next, a modification of the first embodiment of the camera of the present invention will be described. The following description mainly describes the points of variation of the first embodiment of the camera of the present invention with respect to the first embodiment of the camera of the present invention. Therefore, the description about the first embodiment of the camera of the present invention will be applied to the parts not described below. (1.5.1.) Configuration of Modification Now, a configuration of a modification of the first embodiment of the camera of the present invention will be described.

Referring to FIGS. 8 and 9, the finder 120d includes a finder optical system 128d. The finder optical system 128d includes a finder main optical system 130 for forming an image of the subject 126 and a rangefinder optical system 140d for measuring the subject distance (ranging).

On the other hand, the rangefinder optical system 140d includes the rangefinder optical optical axis 140x and the rangefinder pentagonal roof prism 1.
42, a movable objective lens 144 for declination, a semi-transmissive mirror 146d for passing a part of the light beam from the movable objective lens 144 for a declination angle, and reflecting a part of this light beam, and a rangefinder image It includes a mask 148, a second semi-transmissive film surface 134h, and an eyepiece lens 136. The path of the light flux from the subject 126 is changed by the rangefinder pentagonal roof prism 142, and the movable objective lens for deviation angle 144 and the semitransparent mirror 1 are used.
46d, a rangefinder image mask 148, a second semi-transmissive film surface 134h, an eyepiece 136, and a subject image 126f in a part of the viewfinder frame 128f. To be done.

The measurement image optical system 170d includes the semi-transmissive mirror 14
Including 6d.

Further, the luminous flux from the subject passing through the reference image optical system 160 is received to detect the reference image of the subject, and the luminous flux from the subject passing through the measurement image optical system 170d is received to measure the subject. An image detection sensor 166d for detecting an image and detecting a relationship between a reference image of the subject and a measurement image of the subject is provided in the finder 120d. Subject 126 in viewfinder main optical system 130
Is reflected by the first semi-transmissive film surface 132h, the path of the light flux is changed by the reference image pentagonal roof prism 162, passes through the reference image imaging lens 164, and the reference object image is detected by the image detection sensor 166d. Is configured to image a portion of the. Subject 1 in rangefinder optical system 140d
The light flux from 26 is a rangefinder pentagonal roof prism 1
The path of the light beam is changed by 42, and the movable objective lens 1 for declination
The image of the subject for distance measurement is formed on another part of the image detection sensor 166d by being reflected by the semi-transparent mirror 146d through 44.

The image detection sensor 166d operates when the distance measuring mode is set to the "sensor operating mode", that is, "focus aid" by operating the mode setting switch 102m, and the distance measuring mode is set to the "sensor non-operating mode". That is, it is configured not to operate when set to “manual”. The image detection sensor 166d is preferably an area sensor including a CCD or the like. Alternatively,
The image detection sensor 166d may be a line sensor.

The focus calculator 182d is formed in the IC 116d. The focus calculation unit 182d includes the calculation formula storage unit 18
The degree of blurring of the image of the subject can be detected using the arithmetic expression and data stored in 4d.

In this modified example, it is preferable to configure a circuit that performs various functions in the IC 116d. A CPU, ROM, RAM, etc. are provided in the IC 116d. Mode controller 178d, focus detector 180d, focus calculator 18
2d, arithmetic expression storage unit 184d, output control unit 186, display drive unit 188, sound generation drive unit 190, shooting condition storage unit 19
2 is preferably configured within IC 116d. (1 ・ 5 ・ 2) Operation of Modified Example Next, the operation of the modified example will be described.

Referring to FIGS. 8 and 9, the light flux from the reference image pentagonal roof prism 162 forms a subject image on the image detection sensor 166d via the reference image forming lens 164.

When the user 124 operates the distance adjusting mechanism 108, the objective lens moving mechanism is operated in association with the distance adjusting mechanism 108 of the taking lens 104, and the movable objective lens 144 for declination is perpendicular to the optical axis. Move in the direction. A part of the light flux from the movable objective lens 144 for declination is reflected by the semi-transmissive mirror 146d, and a subject image for distance measurement is detected by the image detection sensor 1.
The image is formed at 66d.

When the mode setting switch 102m is operated to set the focus detection mode to "focus aid", the mode controller 178d operates the image detection sensor 166d. Then, the image detection sensor 166d causes the reference image optical system 1 to
Receives the light flux from the subject 126 that is incident from 60,
The light flux from the subject 126 incident from the measurement image optical system 170d is received, and a signal for detecting the image of the subject is output to the focus calculation unit 182d.

When the distance measuring mode is "focus aid", the focus calculation section 182d detects the focus of the image of the subject using the calculation formula and data stored in the calculation formula storage section 184d.

The output control unit 186 outputs the detection result of the focus of the image of the subject based on the signal regarding the detection result of the focus of the image of the subject output from the focus calculation unit 182d.

Next, the operation of the focus calculator 182d will be described.

Referring to FIG. 10, FIG. 10A and FIG.
The signal waveforms 0 (b) and 10 (c) show the output when the image detection sensor 166d is a line sensor. Alternatively, the signal waveforms shown in FIGS. 10A to 10C show the output of one line in each area sensor when the image detection sensor 166d is an area sensor.

FIG. 10A is a diagram schematically showing the shape of a signal output from the image detection sensor 166d when the image formation position of the image of the subject 126 is closer to the object 126 than the image detection sensor 166d. Is. FIG. 10B shows that when the image formation position of the image of the subject 126 is farther from the subject 126 than the image detection sensor 166d, the image detection sensor 1
It is a figure which shows typically the shape of the signal output from 66d. FIG. 10C is a diagram schematically showing the shape of a signal output from the image detection sensor 166d when the image is in focus (when the image is in a matching state, for example, when the distance error is less than 2%). Is.

In FIG. 10, in the image detection sensor 166d, the subject 12 incident from the reference image optical system 160 is detected.
6, the measurement reference line STL of the luminous flux from 6 and the measurement image optical system 17
The reference distance DJK from the measurement reference line of the light flux from the subject 126 incident from 0d is predetermined as a design value of the camera of the present invention. Therefore, the focus calculation unit 1
82d stores in advance the value of the position of the measurement reference line STL, the value of the position of the measurement reference line RLA, and the value of DJC.

As shown in FIG. 10A, the subject 126
The image forming position of the image of the subject 12 from the image detection sensor 166d.
When the position is close to 6, the focus calculation unit 182d outputs the waveform 1
66ad is recognized as a reference waveform, waveform 168ad is recognized as a measurement waveform, and measurement line RL of measurement waveform 168ad is recognized.
Positional shift amount (phase difference) D between A and the measurement reference line STL
The focus of the image of the subject is calculated by calculating JC.

Further, as shown in FIG. 10B, when the image formation position of the image of the subject 126 is farther from the subject 126 than the image detection sensor 166d, the focus calculation unit 182d.
Recognizes the waveform 166bd as the reference waveform,
The focus of the image of the subject is calculated by recognizing bd as a measurement waveform and calculating the amount of positional deviation (phase difference) DJF between the measurement line RLB and the measurement reference line STL of the measurement waveform 168bd.

Further, as shown in FIG. 10C, when the image is in focus (in the matching state, for example, when the distance error is less than 2%), the focus calculator 182d uses the waveform 166cd as a reference. Recognize as a waveform, recognize waveform 168cd as a measurement waveform, and measure line R of measurement waveform 168cd
Positional shift amount (phase difference) between LC and measurement reference line STL
When the DJS is calculated and the difference between the DJS and the reference distance DJK is less than or equal to a predetermined threshold value (for example, less than one pitch of the elements forming the image detection sensor 166d), the image is in focus. It detects that it is in a state. (2) Second Embodiment Next, a second embodiment of the camera of the present invention will be described. The following description mainly describes differences between the second embodiment of the camera of the present invention and the first embodiment of the camera of the present invention. Therefore, the description about the first embodiment of the camera of the present invention will be applied to the parts not described below. (2.1) Configuration of Second Embodiment Referring to FIG. 11, the finder 220 includes a finder optical system 228. The viewfinder optical system 228
A finder main optical system 230 and a rangefinder optical system 240 are included. The finder main optical system 230 passes the main optical system optical axis 230x, the finder objective lens 232, and the light flux from the finder objective lens 232, and reflects the light flux incident from the direction perpendicular to the second light flux.
Beam splitter 234 having semi-transparent film surface 234h
And an eyepiece lens 236 for converging the light flux from the beam splitter 234 and enlarging the image of the subject 126.

The first semi-transmissive film surface 232h is provided on the finder objective lens 232. First semi-permeable membrane surface 232
The h is configured to pass a part of the light flux from the subject 126 that enters the finder objective lens 232 and reflect a part of the light flux. Second semi-permeable membrane surface 234h
Are provided in the beam splitter 234. The second semi-transmissive film surface 234h is configured to pass the light beam from the finder objective lens 232 and reflect the light beam incident from the direction perpendicular to the light beam.

The rangefinder optical system 240 includes the rangefinder optical optical axis 2.
40x, a deflection angle movable rangefinder mirror 242 for reflecting a light beam from the subject 126, a part of the light beam from the deflection angle movable rangefinder mirror 242, and a part of this light beam is reflected. Semi-transmissive mirror 244 and semi-transmissive mirror 24
Rangefinder objective lens 24 for diffusing the luminous flux from
8, the beam splitter 234 and the second semi-transmissive film surface 234h, and the eyepiece lens 236.

The viewfinder 220 is provided with a field frame mask 250 for providing a field frame within the field of viewfinder frame 128f and a mask reflection mirror 252 for reflecting the light flux that has passed through the field frame mask 250.

In the camera 100, the object image 126f by the rangefinder optical system 240 is moved in association with the movement of the taking lens optical system 106 so as to correspond to the operation of the distance adjusting mechanism 108 of the taking lens 104. A mirror rotation mechanism (not shown) for rotating the deflection angle movable range mirror 242 is incorporated.

The finder 220 further has a reference image optical system 260 for forming a reference image of the subject 126 by branching a light beam from the subject 126 that has passed through a part of the finder main optical system 230, and a rangefinder optical system. The light flux from the subject 126 that has passed through a part of the system 240 is branched and the subject 1
And a measurement image optical system 270 for forming the 26 measurement images. The reference image optical system 260 includes the first semi-transmissive film surface 2
32h, a reference image reflection mirror 262 for reflecting the light flux from the first semi-transmissive film surface 232h, and a reference image formation for converging the light flux from the reference image reflection mirror 262 to form an image of the subject 126. And an image lens 264. The measurement image optical system 270 includes the semi-transmissive mirror 244 and the semi-transmissive mirror 24.
And a measurement image forming lens 272 for forming an image of the object 126 by converging the light flux from the light source 4.

A reference image detection sensor 266 for receiving the light flux from the object 126 incident from the reference image optical system 260 to detect an image of the object, and an object 126 incident from the measurement image optical system 270. The viewfinder 220 is provided with a measurement image detection sensor 268 for receiving the light flux and detecting the image of the subject.

The light flux from the subject 126 in the finder main optical system 230 is reflected by the first semi-transmissive film surface 232h, reflected by the reference image reflecting mirror 262, passes through the reference image forming lens 264, and becomes the reference subject. It is configured to form an image on the reference image detection sensor 266.

Object 126 in rangefinder optical system 240
Is reflected by the movable angle measuring mirror 242 for declination, reflected by the semi-transmissive mirror 244, and the measurement image forming lens 272.
And a subject image for distance measurement through the measurement image detection sensor 268.
Is configured to form an image.

The reference image detection sensor 266 and the measurement image detection sensor 268 are constructed so as to operate when the distance measuring mode is set to "focus aid" and not to operate when the distance measuring mode is set to "manual". It (2.2) Operation of the Second Embodiment Referring to FIG. 11, the light flux from the subject 126 is incident on the viewfinder objective lens 232 as it is on the main optical system optical axis 230x. Finder objective lens 232
A part of the light flux from the subject 126 that has entered the eyepiece enters the eyepiece lens 236 via the beam splitter 234.
With the eyepiece lens 236, the subject image 126m (shown by a thick line in FIG. 6) is formed as a virtual image in the field of view of the finder frame 128f.

The other part of the light flux from the subject 126 which has entered the finder objective lens 232 is reflected by the first semi-transmissive film surface 232h and by the reference image reflection mirror 262. The light flux reflected by the reference image reflecting mirror 262 passes through the reference image forming lens 264 and the reference image detecting sensor 26.
An image of the subject is formed on 6.

On the other hand, the light flux from the subject 126 is incident on the deflection angle movable rangefinder mirror 242 and is reflected by the deflection angle movable rangefinder mirror 242, as is the case with the rangefinder optical optical axis 240x. The light flux reflected by the movable angle meter mirror 242 for declination passes through the semi-transmissive mirror 244 and the distance meter objective lens 248, is reflected by the second semi-transmissive film surface 234h, and the eyepiece lens 23.
As shown in FIG. 6, the subject image 126f (indicated by a chain double-dashed line) is imaged on a portion of the field of view of the finder frame 128f through the camera 6.

When the user 124 operates the distance adjusting mechanism 108, the movable angle meter mirror 242 for declination rotates in conjunction with the distance adjusting mechanism 108 of the taking lens 104, and the object image 126f by the distance meter optical system 240 also. It moves in the direction perpendicular to the optical axis. Then, by the eyepiece lens 236,
The subject image 126f (shown by the alternate long and short dash line in FIG. 6) is formed as a real image in a part of the field of view of the finder frame 128f.

The light flux passing through the field frame mask 250 is reflected by the mask reflecting mirror 252, is reflected by the second semi-transmissive film surface 234h, and passes through the eyepiece lens 236.

When the mode setting switch 102m is actuated to set the focus detection mode to "focus aid", the mode controller 178 actuates the reference image detection sensor 266 and the measurement image detection sensor 268. Then, the reference image detection sensor 266 receives the light flux from the subject 126 incident from the reference image optical system 260 and outputs a signal for detecting the image of the subject to the focus calculation unit 182.

When the user 124 sets the distance measuring mode to "focus aid" and operates the distance adjusting mechanism 108,
The declination movable distance meter mirror 242 rotates, and the image of the subject on the measurement image detection sensor 268 moves. The measurement image detection sensor 268 receives the light flux from the subject 126 incident from the measurement image optical system 270 and outputs a signal for detecting the image of the subject to the focus calculation unit 182. (3) Third Embodiment Next, a third embodiment of the camera of the present invention will be described. The following description mainly describes differences between the third embodiment of the camera of the present invention and the first embodiment of the camera of the present invention. Therefore, the description about the first embodiment of the camera of the present invention will be applied to the parts not described below. (3.1) Configuration of Third Embodiment Referring to FIG. 12, the finder 320 includes a finder optical system 328. The viewfinder optical system 328
A viewfinder main optical system 330 and a rangefinder optical system 340 are included. The finder main optical system 330 includes a main optical system optical axis 330x, a finder objective lens 331, a finder pentagonal roof prism 332 for changing a path of a light flux from the finder objective lens 331, and a light flux from the finder pentagonal roof prism 332. Viewfinder field mask 333 for blocking a part
And a condenser lens 334 for converging the light flux that has passed through the finder field mask 333, and a beam splitter 33 for entering the light flux from the condenser lens 334.
5 and an eyepiece lens 336 for converging the light flux from the beam splitter 335 and enlarging the image of the subject 126.

The semi-transmissive film surface 335h is provided on the beam splitter 335. The semi-transmissive film surface 335h is configured to reflect the light flux from the condenser lens 334 and pass the light flux incident from the direction perpendicular to the light flux.

Finder pentagonal roof prism 3
The first reflecting surface 332d of 32 is configured to allow a part of the light beam incident thereon to pass therethrough.

The rangefinder optical system 340 includes the rangefinder optical optical axis 3
40x, a rangefinder pentagonal roof prism 341 for changing the path of the light flux from the subject 126, and a light flux that is movable in the direction perpendicular to the rangefinder optical optical axis 340x and converges from the rangefinder pentagonal roof prism 341. And a part of the light beam from the movable objective lens 342 for declination, and
A semi-transmissive mirror 343 for reflecting a part of the light flux, a measurement image reflection mirror 344 for reflecting the light flux from the semi-transmission mirror 343, and a part of the light flux from the measurement image reflection mirror 344 for blocking the light flux. Rangefinder image mask 345, condenser lens 346 for converging the light flux passing through rangefinder image mask 345, and beam splitter 335.
And a semi-transmissive film surface 335h and the eyepiece lens 336.

In the camera 100, the object image 126f by the rangefinder optical system 340 is moved in association with the movement of the taking lens optical system 106 so as to correspond to the operation of the distance adjusting mechanism 108 of the taking lens 104. An objective lens moving mechanism (not shown) for moving the declination movable objective lens 342 is incorporated.

The finder 320 further includes a reference image optical system 360 for forming a reference image of the subject 126 by branching the light flux from the subject 126 that has passed through a part of the finder main optical system 330, and a rangefinder optical system. The light flux from the subject 126, which has passed through a part of the system 340, is branched to make the subject 1
26 includes a measurement image optical system 370 for forming the 26 measurement images. The reference image optical system 360 includes a reflecting prism 362 for reflecting the light flux passing through the first reflecting surface 332d of the finder pentagonal roof prism 332. The measurement image optical system 370 includes the semi-transmissive mirror 343.

A reference image detection sensor 366 for detecting the image of the subject by receiving the light flux from the subject 126 incident from the reference image optical system 360, and a subject 126 incident from the measurement image optical system 370. A finder 320 is provided with a measurement image detection sensor 368 for receiving a light flux and detecting an image of a subject.

The light flux from the subject 126 in the finder main optical system 330 is reflected by the reflecting prism 362 to form a reference subject image on the reference image detection sensor 366.

Object 126 in rangefinder optical system 340
The light flux from is reflected by the semi-transmissive mirror 343 to form a subject image for distance measurement on the measurement image detection sensor 368. (3.2) Operation of Third Embodiment Referring to FIG. 12, the light flux from the subject 126 is incident on the viewfinder objective lens 331 as it is on the optical axis 330x of the main optical system. Finder objective lens 331
The light flux from the subject 126 that has entered the lens is changed in its path by the finder pentagonal roof prism 332, and the light flux that has passed through the finder field mask 333 and the condenser lens 334 is incident on the beam splitter 335. The light beam from the beam splitter 335 enters the eyepiece lens 336. With the eyepiece lens 336, the subject image 126m (shown by a thick line in FIG. 6) is formed as a virtual image in the field of view of the finder frame 128f. Further, the image of the viewfinder field mask 333 is also the viewfinder frame 12.
The light flux passing through the first reflecting surface 332d of the finder pentagonal roof prism 332 which forms an image within the field of view of 8f is
The subject image which is reflected by the reflecting prism 362 and serves as a reference is formed on the reference image detection sensor 366.

On the other hand, the light flux from the subject 126 is incident on the rangefinder pentagonal roof prism 341 as it is on the rangefinder optical optical axis 340x. The light beam incident on the range finder pentagonal roof prism 341 has its path changed by the range finder pentagonal roof prism 341, passes through the declination movable objective lens 342, the semitransparent mirror 343, and is reflected by the measurement image reflection mirror 344. Rangefinder image mask 345,
After passing through the condenser lens 346, the beam splitter 335, the semitransparent film surface 335h, and the eyepiece lens 336, as shown in FIG. 6, a subject image 126f (shown by a chain double-dashed line).
Is imaged on a part of the field of view of the finder frame 128f.

The light beam from the movable objective lens 342 for declination is reflected by the semi-transmissive mirror 343, and an object image for distance measurement is formed on the measurement image detection sensor 368.

When the user 124 operates the distance adjusting mechanism 108, the objective lens moving mechanism operates in conjunction with the distance adjusting mechanism 108 of the taking lens 104, and the movable objective lens 342 for declination is perpendicular to the optical axis. The object image 126f by the rangefinder optical system 340 also moves in the direction perpendicular to the optical axis. Then, the subject image 126f (shown by the alternate long and short dash line in FIG. 6) is formed as a real image by the eyepiece lens 336 in a part of the field of view of the finder frame 128f.

When the mode setting switch 102m is actuated to set the focus detection mode to "focus aid", the mode controller 178 actuates the reference image detection sensor 366 and the measurement image detection sensor 368. Then, the reference image detection sensor 366 receives the light flux from the subject 126 incident from the reference image optical system 360 and outputs a signal for detecting the image of the subject to the focus calculation unit 182.

When the user 124 sets the distance measuring mode to "focus aid" and operates the distance adjusting mechanism 108,
The movable objective lens 342 for declination moves in the direction perpendicular to the optical axis, and the image of the subject on the measurement image detection sensor 368 moves. The measurement image detection sensor 368 is a measurement image optical system 370.
A light beam from the subject 126 that is incident on the light is received, and a signal for detecting an image of the subject is output to the focus calculation unit 182.

[0125]

Since the present invention is configured as described above in the rangefinder interlocking type camera, it has the remarkable effects described below. (1) In the camera of the present invention, not only the visual judgment of the user but also the visual expression of the matching state between the subject image from the optical path of the finder main optical system in the finder and the subject image from the optical path of the rangefinder optical system, Since the user can be informed by an auditory expression or the like, there is a sense of security in the distance measurement, and the focus can be surely achieved. Therefore, the use of the present invention eliminates the need to upsize the finder in order to improve the accuracy of distance measurement by visual observation. (2) The camera of the present invention can inform the user of the degree of blurring of the subject image by visual expression, auditory expression, or the like. (3) According to the present invention, it is possible to realize a small rangefinder interlocking camera including a double image matching type rangefinder and a focus aid mechanism. That is, the camera of the present invention is configured such that a part of the finder main optical system is used as a reference image optical system and a part of the rangefinder optical system is used as a measurement image optical system. Can be changed.

[Brief description of drawings]

FIG. 1 is a plan view showing configurations of a finder main optical system and a rangefinder optical system in a first embodiment of a camera of the present invention.

FIG. 2 is a perspective view showing the external appearance of the camera in the first embodiment of the camera of the present invention.

FIG. 3 is a rear view showing the outer appearance of the camera according to the first embodiment of the camera of the present invention.

FIG. 4 is a block diagram showing a configuration of a distance measuring unit in the first embodiment of the camera of the present invention.

FIG. 5 is a diagram showing an outline of information regarding a subject output by a detection sensor in the first embodiment of the camera of the present invention.

FIG. 6 is a diagram showing a field of view seen by a finder and contents displayed on the finder in the first embodiment of the camera of the present invention.

FIG. 7 is a diagram showing the content of distance measurement results displayed on the finder in the first embodiment of the camera of the present invention.

FIG. 8 is a plan view showing a configuration of a finder main optical system and a rangefinder optical system in a modification of the first embodiment of the camera of the present invention.

FIG. 9 is a block diagram showing a configuration of a distance measuring unit in a modified example of the first embodiment of the camera of the present invention.

FIG. 10 is a diagram showing an outline of information about a subject output by a detection sensor in a modified example of the first embodiment of the camera of the present invention.

FIG. 11 shows a second embodiment of the camera of the present invention,
It is a top view which shows the structure of a finder main optical system and a rangefinder optical system.

FIG. 12 shows a third embodiment of the camera of the present invention,
It is a top view which shows the structure of a finder main optical system and a rangefinder optical system.

FIG. 13 is a plan view showing a configuration of a finder main optical system and a rangefinder optical system in a conventional rangefinder interlocking camera.

FIG. 14 is a diagram showing a field of view seen by a finder and contents displayed on the finder in a conventional rangefinder interlocking camera.

[Explanation of symbols]

100 cameras 102 camera body 104 shooting lens 106 Photographic lens optical system 108 Distance adjustment mechanism 110 Aperture adjustment mechanism 130 Finder main optical system 140,140d Rangefinder optical system 146,146d Semi-transparent mirror 160 Reference image optical system 166 Reference image detection sensor 166d image detection sensor 168 Measurement image detection sensor 170, 170d Measurement image optical system 174 Output section (display section) 176 Output section (sounding section) 182 Focus calculation unit 182d Focus calculation unit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 13/16 G02B 7/11 N 13/32 A 13/36 G03B 3/00 A 17/18 3/02 17/20 F Term (Reference) 2H011 AA01 BA04 BA06 BB01 BB04 CA18 DA05 EA10 FA03 2H018 AA02 BC02 BE00 BE02 2H051 AA02 BB02 BB05 BB06 BB08 CA05 CA07 CB02 CB11 CB14 BB14 BB14BB32 BB31BB34 BB31BB13A08 2B01 GA03 GA04 GA09 GA13 GA13 GA13 GA13 GA13 GA13 GA13

Claims (6)

[Claims] 1. A finder main optical system for forming an image of a subject, and for forming an image of a part of the subject so as to overlap the image of the subject by the finder main optical system for measuring the subject distance. In a rangefinder interlocking type camera equipped with the rangefinder optical system, a part of a light flux from the subject passing through the viewfinder main optical system (130) is transmitted to form a reference image of the subject serving as a reference for measuring the subject distance. Reference image optical system (1
60) and a measurement image optical system (170) for forming a measurement image of the subject for measuring the subject distance by transmitting a part of the light flux from the subject that passes through the rangefinder optical system (140). , A reference image detection sensor (166) for detecting a reference image of the object by receiving a light beam from the object passing through the reference image optical system (160), and a light beam from the object passing through the measurement image optical system 170. Then, a measurement image detection sensor (168) for detecting the amount of deviation of the measurement image of the subject with respect to the reference image of the subject, a signal related to the image of the subject output by the reference image detection sensor (166), and a measurement image detection sensor. A focus calculation unit (182) for detecting the degree of blurring of the image of the subject based on the signal relating to the image of the subject output by (168), and the degree of blurring of the image of the subject output by the focus calculation unit (182). Based on the detection results relating to the signal output unit for outputting a detection result of the degree of blur of the image of the subject (174,
176), and a camera. 2. A finder main optical system (130) includes a finder objective lens (132) for diffusing a light flux from a subject, and a first semi-transmissive film surface (132h).
Is provided in the viewfinder objective lens (132), and the first semi-transmissive film surface (132h) passes a part of the light flux from the subject incident on the viewfinder objective lens (132),
And is configured to reflect a part of this light flux, and
The camera according to claim 1, wherein the light flux reflected by the semi-transmissive film surface (132h) is configured to be incident on the reference image detection sensor (166). 3. The rangefinder optical system (140) includes a semi-transmissive mirror (146) for passing a part of a light beam from a subject and reflecting a part of the light beam, and the semi-transmissive mirror (146). )
The camera according to claim 1 or 2, wherein the light flux reflected by is incident on a measurement image detection sensor (168). 4. A viewfinder main optical system for forming an image of the object, and for forming a part of the image of the object so as to overlap the image of the object by the viewfinder main optical system for measuring the object distance. In a rangefinder interlocking type camera equipped with the rangefinder optical system, a part of a light flux from the subject passing through the viewfinder main optical system (130) is transmitted to form a reference image of the subject serving as a reference for measuring the subject distance. Reference image optical system (1
60) and a measurement image optical system (170d) for forming a measurement image of the subject for measuring the subject distance by transmitting a part of the light flux from the subject passing through the rangefinder optical system (140d).
And the light flux from the subject passing through the reference image optical system (160) is received to detect the reference image of the subject, and the light flux from the subject passing through the measurement image optical system (170d) is received, Image detection sensor (166d) for detecting the measurement image and detecting the relationship between the reference image of the subject and the measurement image of the subject
And a focus calculation unit (182d) for detecting the degree of blurring of the image of the subject based on a signal relating to the image of the subject output by the image detection sensor (166d), and a focus calculation unit (182d) An output unit (17) for outputting the detection result of the image blur degree of the subject based on the signal relating to the detection result of the image blur degree.
4, 176), and a camera. 5. The finder main optical system (130) includes a finder objective lens (132) for diffusing a light flux from a subject, and a first semi-transmissive film surface (132h).
Is provided in the viewfinder objective lens (132), and the first semi-transmissive film surface (132h) passes a part of the light flux from the subject incident on the viewfinder objective lens (132),
And is configured to reflect a part of this light flux, and
The camera according to claim 4, wherein the light flux reflected by the semi-transmissive film surface (132h) is configured to be incident on the image detection sensor (166d). 6. The rangefinder optical system (140d) includes a semi-transmissive mirror (146d) for passing a part of a light beam from an object and reflecting a part of the light beam, and the semi-transmissive mirror (14d).
The light flux reflected by 6d) is the image detection sensor (166d).
The camera according to claim 4 or 5, wherein the camera is configured to be incident on.