JP2008292609A - Photometric device and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust relative positional relation of an optical axis direction between a photometric lens and a photometric element while miniaturizing a device. <P>SOLUTION: This photometric device has: the photometric element 41 having a light reception part; a holding member 43 holding the photometric element 41; a photometric lens member 42 having a lens part 42a leading light to the light reception part and installation parts 42b, 42c integrally formed outside the lens part 42a; support means 42d, 43c supporting the photometric lens member 42 in the holding member 43 such that the photometric lens member 42 can slide in a direction along an optical axis of the lens part 42a in the installation part 42b; and rotation restriction means 42e, 43d restricting rotation of the photometric lens member 42 around an axis parallel to the optical axis. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a photometric device used for a camera or the like, and a camera including the photometric device.

  In recent cameras, a photometric device is provided for performing automatic exposure control or for notifying a photographer of exposure information. For example, in a single-lens reflex camera, a photometric device including a photometric lens and a photometric element is provided inside the viewfinder, and a primary image of a subject imaged on a focusing screen is focused on the photometric element by a photometric lens. An image formed as an image and subjected to photometry is known. In such a photometric device, if the relative position between the photometric element and the secondary image formed on the photometric element does not match the predetermined positional relationship in the design, the screen area where the photometric element measures light and the image are taken. The desired screen exposure may not be obtained.

  As an adjustment mechanism for this purpose, as disclosed in Patent Document 1 below, the photometric element is X and Y within a plane orthogonal to the light incident direction (Z axis) with respect to the focusing screen of the camera. A technique has been proposed in which the position of the photometric element with respect to the focusing screen is adjusted by moving in the axial direction. In addition, as disclosed in Patent Document 2 below, a technique has been proposed in which the entire photometric device is rotated by a slight angle in the rotational direction about the X axis and the Y axis.

  By the way, recent photometry devices are also required to have a scene recognition function, that is, a function for recognizing an approximate type of subject (for example, mountain, person, sky, etc.) in order to obtain an appropriate exposure. Accordingly, it is necessary to adjust not only the relative positional relationship of the photometric device (or photometric element) to the focusing screen but also the relative position of the photometric element and the photometric lens in the optical axis direction more strictly. For example, in Patent Document 3 below, an annular disk part is integrally formed around the lens part of the photometric lens, and a screw thread (male screw) is formed around the disk part. By providing a lens holding portion (female screw portion) having a female screw opposed to the holder to hold the photometric element, screwing the photometric lens into the lens holding portion, and rotating the photometric lens, A lens in which the relative position of the photometric lens and the photometric element in the optical axis direction (that is, the focal position of the photometric lens with respect to the photometric element) can be adjusted is disclosed.

  However, although the conventional technique described in Patent Document 3 that can adjust the relative positional relationship between the photometric lens and the photometric element in the optical axis direction is excellent in that the relative positional relationship can be adjusted, the camera is as small as possible. There was a problem that it was not possible to cope with this. That is, in this prior art, since it is necessary to provide a disk part around the lens part because the entire photometric lens is screwed to the lens holding part that holds the photometric element, the photometric lens itself can be reduced in size. Is difficult, and it is necessary to provide a lens holding portion for holding the photometric lens in the holder for holding the photometric element, and accordingly, other members (for example, pentaprisms) in which the lens portion is provided in the finder portion are provided. ) And it is necessary to dispose the photometric element in the same manner, and there is a problem that it is difficult to sufficiently meet the demand for miniaturization of the camera.

The present invention has been made in view of these points, and the object of the present invention is to adjust the relative positional relationship between the photometric lens and the photometric element in the optical axis direction while reducing the size of the apparatus. A photometric device and a camera equipped with the photometric device are provided.
Noto 2573985 (No. 4-104610) JP 9-258290 A JP-A-6-265966

  According to the present invention, it has a photometric element having a light receiving portion, a holding member that holds the photometric element, a lens portion that guides light to the light receiving portion, and a mounting portion that is integrally formed on the outside of the lens portion. A photometric lens member; and a supporting means for supporting the photometric lens member on the holding member so that the photometric lens member can slide in a direction along the optical axis of the lens portion in the mounting portion; There are provided a photometric device comprising a rotation regulating means for regulating the rotation of the photometric lens member around an axis parallel to the axis, and a camera comprising the photometric device.

  In the present invention, the photometric lens member is slidable in the direction along the optical axis of the lens portion in the mounting portion (42b, 42c) integrally formed outside the lens portion (42a) of the photometric lens member (42). Since the support means (43c, 42d) for supporting the photometric lens member on the holding member and the rotation restricting means (43d, 42e) for restricting the rotation of the photometric lens member are provided, the photometry element and the photometry The positional relationship in the direction along the optical axis with the lens member can be adjusted, and the mounting portion can be shaped and sized so that the support means and the rotation restricting means are interposed, thereby reducing the size of the photometric lens member itself. There is an effect that it can be planned. When this photometric device is attached to a camera or the like, the lens portion is placed close to the other member by arranging the mounting portion so as not to interfere with other members (such as a pentaprism) of the camera. It is possible to reduce the size of the camera.

  In the description of this section, the member reference numerals shown in the drawings representing the embodiments to be described later are appended with parentheses, but this is merely for ease of understanding, and each constituent element of the present invention includes these constituent elements. It is not limited to the member shown to drawing which attached | subjected the member code | symbol.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Overall camera configuration]
FIG. 1 is a side sectional view schematically showing a schematic configuration of a camera according to an embodiment of the present invention. The camera of this embodiment is a single-lens reflex digital camera that mainly captures still images. However, the camera to which the photometric device according to the present invention is applicable may not be a single lens reflex system, but may be a film camera. Furthermore, not only a camera that captures still images, but also a video camera that captures moving images may be used. In addition, it may be a mobile terminal with a camera function (such as a mobile phone or a PDA) or another device having a photographing function.

  In FIG. 1, the camera CM is configured to include a camera body CB and a photographing lens CL that is interchangeably attached to the camera body CB. The taking lens CL is attached to the camera body CB via the lens mount LM. Note that the photographing lens CL is not interchangeable and may be integrally fixed to the camera body CB. A finder portion FD is attached to the upper portion of the camera body CB so as to be integrated or replaceable.

  Inside the camera body CB, an image sensor 11 such as a CCD or CMOS having a high resolution (for example, 10 million pixels) is attached. The image sensor 11 converts an image of a subject formed on the imaging surface into an image signal and outputs the image signal. An optical member 12 such as an infrared cut filter for cutting infrared light, an optical low-pass filter, and protective glass for protecting the image pickup surface is provided on the front surface of the image pickup device 11 (on the photographing lens CL side). It has been.

  A mechanical shutter 13 for adjusting the exposure time (shutter time) by mechanically driving the light shielding member is provided on the front side of the image sensor 11. Although not shown in detail, the mechanical shutter 13 has a front curtain and a rear curtain as a light shielding member driven by a driving device including an actuator and the like, and a release switch (button) for taking a still image is provided. When pressed (fully pressed), first, the front curtain travels from the state where the image pickup surface of the image sensor 11 is shielded to the state where the image pickup surface is opened, and corresponds to the shutter time set appropriately. After a lapse of time, the vehicle travels so that the rear curtain is in a state of shielding the imaging surface from a state of opening the imaging surface. The subject image via the photographing lens CL is formed on the imaging surface of the imaging element 11 after the front curtain travels until the rear curtain travel is completed.

  The finder unit FD is an optical finder for visually observing an optical image of a subject formed through the photographing lens CL, a quick return mirror RM described later, and the like through the eyepiece window 21. The finder unit FD includes a focusing screen (focus plate) 22, a pentaprism (pentahach prism) 23, an eyepiece lens system 24, and the like. In addition, a triangular prism 25 is provided in the finder portion FD above the exit surface 23a of the pentaprism 23, and a photometric unit (photometric device) 40 is disposed above the triangular prism 25.

  The photometric unit 40 includes a photometric element 41, a photometric lens (photometric lens member) 42, and the like, and forms an image on the light receiving surface of the photometric element 41 via the photometric lens 41 in order to determine a shutter speed and an aperture value. This is a device for measuring the brightness of an image to be displayed.

  On the back surface of the camera body CB, an image display monitor (liquid crystal panel) (not shown) capable of displaying an image formed on the image sensor 11 is provided. In addition to the image, various menu screens, selection screens, and the like are displayed on the image display monitor under the control of a control device (control microcomputer) (not shown) provided in the camera.

  In the camera body CB, a quick return mirror RM is pivotally supported on the front side of the image sensor 11 (further front side than the mechanical shutter 13). A sub mirror (not shown) is provided on the back side (lower side) of the quick return mirror RM. The quick return mirror RM blocks the front surface of the image pickup device 11 at about 45 degrees with respect to the image pickup surface of the image pickup device 11, that is, a mirror-down state arranged in the optical path of the taking lens CL, and clockwise in FIG. The mirror is turned up to be substantially orthogonal to the imaging surface of the imaging device 11 (substantially parallel to the lower side of the focusing screen 22), that is, in a mirror-up state arranged outside the optical path of the photographic lens CL (in FIG. 1, an alternate long and short dash line) This is a mirror that can be selectively operated at high speed.

  The quick return mirror RM is driven by a driving device (not shown). The quick return mirror RM and the mechanical shutter 13 described above are driven by the same driving device. A part of the quick return mirror RM (near the center) is a half mirror, and the other part is a total reflection mirror. The quick return mirror RM is in a mirror-down state, and most of the light from the photographing lens CL Is reflected toward the finder portion FD (focusing screen 22), and a part of the light transmitted through the half mirror portion is reflected by the sub mirror. The light reflected by the sub mirror enters an AF detection element (not shown) of a known phase difference detection system via an optical system (not shown).

  When the quick return mirror RM is switched to the mirror-up state, light from the photographing lens CL is incident on the image sensor 11 via the mechanical shutter 13.

  The photographing lens CL is a photographing optical system for forming an image of a subject on the imaging surface of the image sensor 11. In FIG. 1, the photographing lens CL is a zoom lens whose focal length can be changed, but may be a single focal lens. A fish eye lens, a wide-angle lens, a telephoto lens, a micro lens, and the like can be arbitrarily exchanged and mounted.

  The photographing lens CL includes a main lens 31, a lens system 32 including a plurality of lenses including a focal length adjustment lens and a focus lens (focus adjustment lens), a diaphragm 33, and the like inside the lens barrel. . The focal length adjustment lens and the focus adjustment lens are each attached so as to be movable in a direction along the optical axis of the photographing lens CL.

  The focal length adjusting lens is configured so that the position of the optical axis direction changes when the photographer manually rotates a zoom ring (not shown) and the focal length of the photographing lens CL can be changed accordingly. Yes. The position of the focus adjustment lens in the direction along the optical axis is changed by a drive motor (actuator), and the change in the position is monitored by an encoder. The diaphragm 33 is a variable aperture diaphragm for adjusting the amount of light incident on the image sensor 11, and the diaphragm setting is set automatically based on the output of the photometric unit 40 or the like, or manually by the photographer. Is done.

  Although not shown on the upper or rear surface of the camera body CB, various types including various switches for the photographer to manually input the instruction content, an operation unit such as a push button, a dial, a cross key, and a photographing mode. An information display panel (a small liquid crystal panel different from the image display monitor) for displaying the setting contents is arranged. As the operation unit, a power dial for turning on / off the power, a release button, a menu button, an item selection cross key, an OK button (decision button), and the like are provided.

  The quick return mirror RM is in a basic posture in the mirror-down state, and is normally in this posture, and the image of the subject from the photographing lens CL is reflected upward by the quick return mirror RM and 1 on the focusing screen 22. The next image is formed and guided to the eyepiece lens system 24 via the pentaprism 23 so that the photographer can visually observe the image of the subject through the viewing window 21.

  In this state, a part of the primary image of the subject imaged on the focusing screen 22 is guided to the photometry unit 40 via the pentaprism 23 and the triangular prism 25, and the photometry lens 42 provided in the photometry unit 40 is provided. As a result, a secondary image is formed on the photometric element 41 to perform photometry. The photometric element 41 and the photometric lens 42 are integrated by a holder 43, and the holder 43 is supported on a support substrate 45 via a holder support portion 44. Details of the support structure of the photometric unit 40 will be described later.

  An output from the photometric element 41 is converted into a luminance value by a luminance information conversion circuit (not shown) and supplied to a control device provided in the camera. The control device sends the luminance value information and a ROM in the photographing lens CL. Based on the lens data, etc., the optimum exposure value is calculated, and the optimum exposure value is displayed on the display unit in the image display or viewfinder.In the automatic exposure mode, the optimum exposure is obtained. By outputting a control signal to the drive circuit of the mechanical shutter 13 and the drive circuit of the aperture 33, the shutter speed and the aperture amount are automatically adjusted.

  When a still image shooting operation (an operation in which the release button is fully pressed) is performed, the quick return mirror RM is switched to the mirror-up state, and the mechanical shutter 13 is operated almost simultaneously with the quick return mirror RM. The original basic posture is quickly returned to the mirror-down state. Thus, one image is captured and recorded on a recording medium such as a memory card provided in the camera. When the quick return mirror RM is in the mirror-up state, the supply of the subject image to the finder unit FD is interrupted for a moment. In addition, when performing moving image shooting or moving image display on an image display monitor, the quick return mirror RM continuously maintains the mirror-up state.

[Metering unit]
Next, with reference to FIG.2 and FIG.3, the structure and support structure of the photometry unit 40 are demonstrated in detail. FIG. 2 is a perspective view showing the main configuration of the photometric unit and the vicinity thereof. The photometric unit is shown in an exploded manner. FIG. 3 is a diagram showing a main configuration of the photometric unit and its vicinity, and is a partial cross-sectional view seen from the front of the camera.

  The photometric unit 40 includes a photometric element 41 having a light receiving surface (light receiving part), a lens part 42a for guiding light to the light receiving surface of the photometric element 41, and attachment parts 42b and 42c integrally formed on the outside of the lens part 42a. The photometric lens 42, the holder (holding member) 43 that holds the photometric element 41, and the mounting portion 42b so that the photometric lens 42 can slide in the direction along the optical axis of the lens portion 42a. Lens support members 43c and 42d supported by the lens 43, lens rotation restricting members 43d and 42e for restricting the rotation of the photometry lens 42 around an axis parallel to the optical axis of the lens portion 42a, a support substrate 45, and the like. ing.

  The lens support means includes a cylindrical projection (fitting portion) 42d and a guide shaft (guide portion) 43c that is slidably fitted to the cylindrical projection 42d. The guide shaft 43c is provided integrally with the holder 43 so as to protrude in a direction substantially parallel to the optical axis of the lens portion 42a, and the cylindrical protrusion 42d is provided integrally with the mounting portion 42b of the photometric lens 42. Yes. The lens rotation restricting means includes a locking pin (protrusion) 43d provided integrally with the holder 43, and a locking hole 42e provided in the attachment portion 42c and into which the locking pin 43d is slidably fitted. Configured.

  The photometric unit 40 includes a coil spring (elastic member) 47 that urges the photometric lens 42 in a direction away from the photometric element 41 in a state where the guide shaft 43 c is fitted to the cylindrical protrusion 42 d, and an attachment of the coil spring 47. An adjustment screw (adjustment member) 48 for adjusting the position of the photometric lens 42 in the direction along the optical axis is also provided, which presses the mounting portion 42b against the force.

  Here, a two-dimensional CCD is used as the photometric element 41, and the secondary image of the subject imaged on the light receiving surface is divided into a plurality of photometric areas in the vertical and horizontal directions for photometry. Each photometric area is assigned one pixel corresponding to the three primary colors R (red), G (green), and B (blue), for a total of three pixels. The number of divisions in this case is not particularly limited, and examples thereof include 480 divisions and 1005 divisions. The photometric element 41 is not limited to such a two-dimensional CCD, and a silicon photodiode (SPD) or the like may be used.

  The photometric element 41 is fixed to the holder 43. The holder 43 is a substantially rectangular member in plan view, and has a substantially rectangular window 43a at the center thereof, and the photometric element 41 is directed downward with its light receiving surface corresponding to the window 43a. It is attached to the holder 43 by adhesion or the like. Three of the four corners of the holder 43 are formed with holes 43b into which the screws 46 are loosely fitted. In addition, a cylindrical guide shaft 43c that protrudes downward and a cylindrical locking pin 43d that also protrudes downward are integrally formed on the lower surface of the holder 43. As shown in the figure, the guide shaft 43c and the locking pin 43d are provided at substantially the center of the left and right side portions of the holder 43 so as to correspond to each other across the window 43a of the holder 43. . A screw hole 43e (see FIG. 3) is formed in the guide shaft 43c from its lower end surface.

  The photometric lens 42 is integrally provided with a pair of plate-like attachment portions (a left attachment portion 42b and a right attachment portion 42c) so as to protrude to the left and right of the lens portion 42a. A cylindrical projection 42d protruding upward is integrally formed on the upper surface of the left mounting portion 42b of the photometric lens 42. The cylindrical projection 42d is a cylindrical projection having an inner cylindrical portion that penetrates vertically, and is a member into which the guide shaft 43c of the holder 43 is slidably fitted. Further, a penetrating locking hole 42e is formed in the right mounting portion 42c of the photometric lens 42. The locking pin 43d of the holder 43 is slidably fitted in the locking hole 42e.

  In the state in which the coil spring 47 is disposed outside the cylindrical projection 42d, the photometric lens 42 is fitted with the guide shaft 43c of the holder 43 on the inner cylindrical portion inside the cylindrical projection 42d, and from below the left mounting portion 42b. The adjustment screw 48 is inserted and screwed into a screw hole 43e formed in the guide shaft 43c, whereby the adjustment screw 48 is attached to the holder 43. At this time, the locking pin 43d of the holder 43 is fitted into the locking hole 42e of the right mounting portion 42c of the photometric lens 42, and the rotation of the photometric lens 42 around the axis parallel to the optical axis of the lens portion 42a is restricted, The relative positional relationship of the lens portion 42a with respect to the photometric element 41 in a plane orthogonal to the optical axis is defined.

  The relative positional relationship of the lens unit 42a with respect to the photometric element 41 in the optical axis direction (defocus amount between the focal position of the lens unit 42a and the light receiving surface of the photometric element 41) is adjusted by appropriately adjusting the screwing amount of the adjusting screw 48. , Can be fine-tuned. The adjustment screw 48 is a normal screw having an umbrella part (head part) 48a and a screw part 48b. When the screw part 48b is screwed into the screw hole 43e, the umbrella part 48a moves the lower surface of the left attachment part 42b to the coil spring 47. The position can be adjusted by pressing against the urging force.

  The support substrate 45 integrally has three protrusions 45 a oriented upward, and these protrusions 45 a are arranged so as to correspond to the three holes 43 b formed in the holder 43, respectively. . These projections 45a are respectively formed with screw holes from the upper end face, and coil springs 49 are respectively arranged on the outer sides thereof, and screws 46 are screwed through the holes 43a of the holder 43, thereby photometry. A holder 43 holding the element 41 and the photometric lens 42 is elastically supported by the support substrate 45. By adjusting the screwing amount of each screw 46, the photometric element 41 and the photometric lens 42 can be slightly rotated around the front and rear axes and the left and right axes, and the inclination thereof can be finely adjusted. The support substrate 45 is fixed to a camera frame (not shown) in a state where the relative position to the triangular prism 25 and the pentaprism 23 is appropriately set.

  In the configuration of the above-described embodiment, adjustment of the relative position of the photometry lens 42 in the optical axis direction with respect to the photometry element 41 (adjustment by screwing the adjustment screw 48) can be performed even when the photometry unit 40 is assembled to the camera. However, the relative position adjustment may be performed before the camera is incorporated into the camera, and the photometric unit 40 may be assembled into the camera thereafter. As a procedure at this time, for example, before the holder 43 to which the photometric element 41 is fixed is supported on the support substrate 45, the image forming state of the lens portion 42 a of the photometric lens 42 with respect to the photometric element 41 is adjusted using the adjustment screw 48. Adjustment can be carried out, and then supported by the support substrate 45 and assembled to the camera. At this time, in order to surely prevent the adjustment screw 48 from rotating, after adjusting the relative position, the adjustment screw 48 may be attached and fixed using an adhesive or the like and then assembled to the camera.

  According to the present embodiment, the photometric lens 42 is slidably supported on the holder 43 via the lens support members 42d and 43c by the plate-like mounting portion 42b of the photometric lens 42. Compared with the prior art in which it is necessary to provide a disk-shaped mounting portion, the photometric lens itself can be made smaller, and thus the photometric unit can be miniaturized. In addition, since the photometric unit 40 can be incorporated in the camera so that the left and right mounting portions 42b, 42c of the photometric lens 42 are along the left-right direction of the camera, at least the disc portion of the photometric lens is made from the pentaprism. Compared with the prior art that must be arranged apart from each other, the lens portion 42a can be arranged close to the pentaprism 23, and therefore the entire photometric unit 40 including the photometric element 41 is brought close to the pentaprism 23. Therefore, it is possible to reduce the size of the viewfinder, and thus the size of the entire camera.

  Note that the fitting length of the lens support members 42d and 43c (the dimension of the guide shaft 43c and the cylindrical protrusion 42d in the optical axis direction of each other) is 1 and the fitting diameter (the outer diameter of the guide shaft 43c or the cylindrical shape). It is desirable that the dimensions of each part of the guide shaft 43c and the cylindrical protrusion 42d are set so that the relation of φ <l is satisfied, where φ is the inner diameter of the protrusion 42d. By doing so, the posture of the lens unit 42a with respect to the photometric element 41 is stabilized, and even if there is a slight manufacturing error in the holder 43 and the photometric lens 42, the imaging surface due to the inclination of the lens unit 42a. This is because the inclination of the can be reduced.

  In the above description, the lens 43 is provided with the guide shaft 43c on the holder 43 and the cylindrical projection 42d on the photometric lens 42 with which the guide shaft 43c is fitted. A cylindrical projection similar to the cylindrical projection 42d may be provided, and a guide shaft similar to the guide shaft 43c may be provided on the photometric lens 42. Similarly, in the above description, as the lens rotation restricting member, the holder 43 is provided with the locking pin 43d, and the photometric lens 42 is provided with the locking hole 42e into which the locking pin 43d is fitted. Alternatively, the holder 43 may be provided with a locking hole similar to the locking hole 42e, and the photometric lens 42 may be provided with a locking pin similar to the locking pin 43d. In addition, the lens support members 42d and 43c are provided on the left mounting portion 42b side of the photometric lens 42, and the lens rotation restricting members 42e and 43d are provided on the right mounting portion 42c side. A lens rotation restricting member may be arranged on the left side mounting part 42b side on the right side mounting part 42c side of the photometric lens 42.

  Further, the lens rotation restricting means is not limited to the above-described one comprising the locking pin 43d and the locking hole 42e, and any means that can restrict the rotation around the axis parallel to the optical axis of the photometric lens 42 may be used. For example, in the above description, the guide shaft 43c constituting the lens support means is formed in a columnar shape and the cylindrical protrusion 42d is formed in a cylindrical shape. However, the cross-sectional shape of the guide shaft is rectangular and other polygonal columnar bodies. By matching the cross-sectional shape of the inner cylindrical portion of the projection to the shape of the guide shaft, the rotation about the axis parallel to the optical axis may be restricted while sliding in the optical axis direction is possible. .

  In the above-described embodiment, the relative position adjustment of the photometric lens 42 in the optical axis direction with respect to the photometric element 41 is performed by screwing the adjusting screw 48 so as to resist the urging force of the coil spring 47 and this. The adjustment screw 48 or the adjustment screw 48 and the coil spring 47 may be omitted. In this case, a dedicated device for finely adjusting the relative position of the photometric lens 42 in the optical axis direction with respect to the photometric element 41 fixed to the holder 43 while the photometric lens 42 is slidably held in the holder 43. After adjusting to a predetermined positional relationship using (or a tool), the photometric lens 42 is fixed to the holder 43 using an adhesive or the like, and then assembled to the camera.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment includes all design changes and equivalents belonging to the technical scope of the present invention.

It is sectional drawing which shows schematic structure of the camera of embodiment of this invention. It is a perspective view which shows the principal part structure of the photometry unit of embodiment of this invention, and its vicinity. It is sectional drawing seen from the camera back side which shows the photometry unit of embodiment of this invention, and the principal part structure of the vicinity.

Explanation of symbols

  CM ... Camera, CB ... Camera body, CL ... Photographing lens, FD ... Finder section, RM ... Quick return mirror, 11 ... Imaging device, 13 ... Mechanical shutter, 22 ... Focusing screen, 23 ... Pental prism, 33 ... Aperture, 40 ... photometric unit, 41 ... photometric element, 42 ... photometric lens, 42a ... lens part, 42b ... left side mounting part, 42c ... right side mounting part, 42d ... cylindrical projection, 42e ... locking hole, 43 ... holder, 43c ... guide Shaft, 43d ... locking pin, 45 ... support substrate, 47 ... coil spring, 48 ... adjustment screw.

Claims (11)

A photometric element having a light receiving portion;
A holding member for holding the photometric element;
A photometric lens member having a lens part for guiding light to the light receiving part and an attachment part integrally formed on the outside of the lens part;
Support means for supporting the photometric lens member on the holding member so that the photometric lens member is slidable in a direction along the optical axis of the lens portion in the attachment portion;
Rotation restricting means for restricting rotation of the photometric lens member around an axis parallel to the optical axis;
A photometric device comprising: The support means includes a fitting portion and a guide portion slidably fitted to the fitting portion,
One of the fitting part and the guide part is provided integrally with the holding member so as to protrude in a direction substantially parallel to the optical axis of the lens part,
The photometric device according to claim 1, wherein the other of the fitting part and the guide part is provided integrally with the attachment part. One of the fitting part and the guide part is a columnar protrusion,
The photometric device according to claim 2, wherein the other of the fitting portion and the guide portion is a cylindrical protrusion that is slidably fitted to the outside of the columnar protrusion.   The columnar protrusion is a columnar protrusion, and the dimension of the optical axis direction of the fitting portion of the columnar protrusion and the cylindrical protrusion is larger than the outer diameter of the cylindrical protrusion or the inner diameter of the cylindrical protrusion. The photometric device according to claim 3, wherein the photometric device is set to be   The rotation restricting means has a protrusion integrally provided on one of the holding member and the attaching portion, and a hole provided on the other of the holding member and the attaching portion, into which the protrusion is fitted. The photometric device according to any one of claims 1 to 4. An elastic member that biases the photometric lens member in a direction away from the photometric element in a state in which the fitting portion and the guide portion are fitted;
An adjusting member that presses the mounting portion against the urging force of the elastic member and adjusts the position of the photometric lens member in the direction along the optical axis;
The photometric device according to claim 2, further comprising:   The photometric device according to claim 6, wherein the elastic member is a coil spring.   The adjustment member is a screw member having a screw part that is screwed into a screw hole formed in the guide part in a direction substantially parallel to the optical axis direction and an umbrella part that contacts the fitting part, The photometric device according to claim 6 or 7, wherein the position of the photometric lens member is adjusted by screwing a screw member.   After fitting the guide portion and the fitting portion and sliding the photometric lens member so that the lens portion has a predetermined positional relationship with respect to the photometric element, the photometric lens member is The photometric device according to any one of claims 2 to 5, wherein the photometric device is fixed to the holding member.   The photometric device according to claim 9, wherein the photometric lens member is bonded and fixed to the holding member using an adhesive.   A camera comprising the photometric device according to claim 1.

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