JP2010128199A - Single-lens reflex camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single-lens reflex camera configured to start range-finding operation earlier by surely suppressing mirror bound of both main and sub reflection mirrors caused in mirror-down operation. <P>SOLUTION: The single-lens reflex camera includes: a fixed member; the main reflection mirror 13 pivotally supported on the fixed member and for turnably moving between an observation position and a retreat position; the sub reflection mirror 14 provided to be turnable relatively to the main reflection mirror, and turnable relatively between a first state where it opens at a predetermined angle to the main reflection mirror when the main reflection mirror exists at the observation position, and a second state where it is superposed on the main reflection mirror when the main reflection mirror exists at the retreat position, and equipped with a portion to be engaged 62a provided to suppress bound in the first state; and an engaging member 52c provided on the fixed member and engaged with the portion to be engaged interlocked with the sub reflection mirror's shifting from the second state to the first state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a single-lens reflex camera, and more particularly to a single-lens reflex camera provided with a quick-return type mirror driving device driven by a driving force of a driving motor.

  Conventionally, a digital camera, which is a photographing device configured to obtain an image data file by photoelectrically converting a light image of a subject formed based on a light beam from a subject incident through a photographing lens by an image sensor, is practically used. And widely used.

  There are various types of such conventional digital cameras. For example, a single-lens reflex digital camera (hereinafter abbreviated as a single-lens reflex camera) equipped with a quick-return mirror drive device is put into practical use. Has been.

  A mirror driving device in a conventional single-lens reflex camera has an observation position (mirror down state) that is arranged on the optical path of the photographing lens and guides a subject luminous flux that is transmitted through the photographing lens to the viewfinder device side that is an observation optical system. The camera body so that it can be pivoted to and retracted from the retracted position (mirror-up state) where the subject luminous flux that is retracted from the optical path of the photographic lens and passes through the photographic lens is guided to the image sensor side. , A drive source for moving the reflection mirror to an observation position where the reflection mirror is disposed on the optical path and a retreat position where the reflection mirror is retracted from the optical path, and a drive unit which controls the drive Etc. are constituted. For example, a small motor or the like is used as a power source of the mirror driving device.

  The reflection mirror includes a main reflection mirror (main mirror) that guides an optical image formed by a light beam incident through the photographing lens to the viewfinder optical system when in the observation position, and a substantially central portion of the main reflection mirror. A sub-reflecting mirror (sub-mirror) that guides the light beam that has passed through a part of the area to the distance measuring device side.

  As described above, the main reflection mirror is pivotally supported on the fixed member inside the camera body, and the drive control of the drive source by the drive unit is performed, so that the main reflection mirror is appropriately observed at a necessary timing. It is designed to rotate between the position and the retracted position.

  The sub-reflecting mirror is provided so as to be rotatable relative to the main reflecting mirror. The main reflecting mirror is interlocked with the main reflecting mirror that rotates between the observation position and the retracted position. By rotating relative to the main reflection mirror, a predetermined state corresponding to the position of the main reflection mirror is obtained.

  In this case, when the main reflection mirror is disposed at the observation position, the sub-reflection mirror is in an open state having a predetermined angle with respect to the main reflection mirror. When the sub-reflection mirror is in the open state, as described above, the light beam that has passed through a partial region of the substantially central portion of the main reflection mirror is reflected and guided to the distance measuring device side below the camera. .

  Further, the sub-reflecting mirror is in a closed state in which the sub-reflecting mirror is disposed so as to overlap the back side of the main reflecting mirror when the main reflecting mirror is disposed at the retracted position. When the sub-reflection mirror is in the closed state, as described above, the light beam from the subject is guided to the image sensor side.

  In a conventional single-lens reflex camera equipped with a mirror driving device having such a configuration, when a shooting operation is performed, first, the reflecting mirror rotates from the observation position to the retracted position and stops at the predetermined retracted position. In addition, this pause state is maintained.

  When the reflecting mirror is in this state, the shutter device is driven to irradiate the light receiving surface of the image sensor with a predetermined amount of subject light flux. In response to this, the image sensor performs a predetermined exposure operation. After this exposure operation is completed, the reflecting mirror rotates from the retracted position to the observation position.

  Thus, when the reflecting mirror pivots from the retracted position to the observing position and stops at the observing position, the reflecting mirror is abruptly stopped from the state of moving in one direction. At this time, since the inertial force of movement in one direction works, it is difficult to stop the reflecting mirror immediately at the predetermined stop position. The reflecting mirror is in a so-called mirror bound state for a predetermined time.

  This mirror bound state is a phenomenon that occurs in the main reflection mirror, and also occurs in the sub-reflection mirror that rotates relative to the main reflection mirror.

  Thus, when the main / sub-reflection mirror is in the mirror bound state, the image formed by the main / sub-reflection mirror is in an unstable state. In this case, in particular, in order to ensure the distance measurement accuracy by the distance measurement operation performed by receiving the image from the sub-reflection mirror, control is performed so that the distance measurement operation is started with the sub-reflection mirror completely stopped. There is a need. For this reason, the distance measuring operation cannot be performed while in the mirror bound state, and there is a problem that, for example, a continuous shooting function for performing a continuous photographing operation is limited.

  Therefore, in a conventional single-lens reflex camera, various proposals have been made on a mirror bound prevention device, for example, in Japanese Patent Laid-Open No. 9-274250 in order to suppress the mirror bound state of the reflecting mirror.

The mirror bounce prevention device of a single-lens reflex camera disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-274250 includes a mirror, a holding member that holds the mirror, and contacts the holding member to bring the holding member into a predetermined position. The holding member is provided with a U-shaped groove that can contact the restriction member at a predetermined position. With this configuration, in the camera disclosed in the above publication, when the holding member returns to the observation position (when the mirror is down), the regulating member comes into contact (fitting) with the U-shaped groove of the holding member, so that the mirror bounce Can be deterred. As a result, the bounce time of the sub mirror can be shortened, and the start of the distance measurement is advanced to increase the number of shots per unit time during the continuous shooting operation by autofocus.
JP-A-9-274250

  However, in the conventional single-lens reflex camera mirror bounce prevention device disclosed in Japanese Patent Application Laid-Open No. 9-274250, etc., when the holding member and the regulating member are fitted together to prevent the mirror bounce of the sub mirror. Although the movement of the sub-mirror (sub-reflection mirror) in the rotation direction can be restricted, the suppression of the movement in the direction along the sub-mirror plane accompanying the bounce of the main mirror is not considered. In addition, no consideration is given to suppressing the mirror bound of the primary mirror.

  For this reason, when the main mirror enters a bound state, there is a problem that the vibration may cause the sub mirror to vibrate in a direction along the main mirror plane.

  Therefore, even if the configuration disclosed by the rear side is adopted, it is still impossible to reliably suppress the mirror bound of the sub mirror when the mirror is down. There remains a problem that it may not be possible to ensure.

  The present invention has been made in view of the above-described points, and an object of the present invention is to form a sub-reflection mirror that reliably suppresses the mirror bounce of the main and sub-reflection mirrors that occurs when the mirror is down. By shortening the time until the image becomes stable, the start of the distance measurement operation can be accelerated, and therefore, the number of images taken per unit time during continuous shooting operation with autofocus can be increased. It is to provide a single-lens reflex camera that enables this.

  In order to achieve the above object, a single-lens reflex camera according to the present invention includes a fixing member, a main reflection mirror that is pivotally supported by the fixing member and is capable of rotating between an observation position and a retracted position, and the main reflection mirror. A first state in which the main reflection mirror is opened at a predetermined angle with respect to the main reflection mirror when the main reflection mirror is in the observation position, and the main reflection mirror is in the retracted position. A sub-reflection mirror provided with an engaged portion that can be relatively rotated between the second state and the second state that sometimes overlaps the main reflection mirror, and is provided to suppress bounce in the first state; An engaging member that is provided on the fixing member and engages with the engaged portion in conjunction with the transition of the sub-reflection mirror from the second state to the first state. It is characterized by.

  According to the present invention, it is possible to reliably prevent mirror bounce of the main and sub-reflection mirrors when the mirror is down, and to shorten the time until the image formed by the sub-reflection mirror becomes stable. It is possible to provide a single-lens reflex camera that can start the operation earlier, and thus can increase the number of images to be taken per unit time during continuous shooting operation by autofocus.

  The present invention will be described below with reference to the illustrated embodiments.

  1-23 is a figure explaining one Embodiment of this invention. Among these, FIG. 1 is a longitudinal sectional view showing the internal configuration of the single-lens reflex camera of the present embodiment. FIG. 2 is a cross-sectional view of the single-lens reflex camera of this embodiment. FIG. 3 is an enlarged exploded perspective view of a main part of the main component unit of the single-lens reflex camera according to the present embodiment. FIG. 4 is an enlarged perspective view of a main part showing a state in which main constituent units of the single-lens reflex camera of this embodiment are assembled. FIG. 5 is a sectional view taken along line [V]-[V] in FIG. 6 is an essential part enlarged perspective view showing a state in which some constituent members (part of the mirror drive and shutter charge device and shutter device, etc.) are removed from the main constituent unit in the state of FIG. FIG. 7 is an essential part enlarged perspective view showing only the components related to the reflection mirror mechanism and the mirror bound prevention mechanism in the single-lens reflex camera of this embodiment. FIG. 8 is an essential part enlarged perspective view showing only the reflection mirror mechanism in the single-lens reflex camera of the present embodiment.

  9 to 19 are diagrams illustrating the operation of the mirror driving device in the single-lens reflex camera according to the embodiment of the present invention.

  20 and 21 are plan views of the reflecting mirror mechanism when the mirror driving device side is viewed from the inside of the mirror box. Among these, FIG. 20 is a diagram illustrating a state in which the engagement pin of the SMB lever is engaged with the engaged portion of the sub mirror lever. FIG. 21 is a diagram showing a disengaged state between the engaged portion of the sub mirror lever and the engaging pin of the SMB lever.

  FIG. 22 and FIG. 23 are diagrams showing a comparison of the situation of the mirror bounce that occurs when each reflection mirror of the reflection mirror mechanism shifts from the mirror-up state to the mirror-down state in the camera of this embodiment and the conventional camera. is there. Among these, FIG. 22 shows the mirror bound state of the main mirror in the reflecting mirror mechanism. FIG. 23 shows the mirror bound state of the sub mirror in the reflecting mirror mechanism. In FIGS. 22 and 23, a solid line indicates a mirror bounce state in the camera of the present embodiment, and a dotted line indicates a mirror bounce state in a conventional camera.

  First, a schematic configuration of the single-lens reflex camera of the present embodiment will be described below mainly using FIG. 1 and FIG.

  A single-lens reflex camera (hereinafter simply referred to as a camera) 1 of the present embodiment includes a front cover 8A that covers a part of the front surface and the bottom surface, a rear cover 8B that covers a part of the back surface and the bottom surface, and an upper cover that covers the top surface. A camera housing is formed by an exterior member such as 9.

  Various constituent units, for example, a mirror box 12 having a reflecting mirror mechanism 2 provided therein, an imaging unit 16 including an imaging element 16, and the like, a finder unit 4 constituting the observation optical system, and a ranging unit 5 , A display unit 6, a strobe unit 7, a shutter device 15, a battery 26 as a driving source of the camera 1, and the like are arranged at predetermined positions.

  A body mount (camera mount) 11 is provided on the front side of the mirror box 12. The body mount 11 is a connecting member that allows a photographing lens (not shown) to be attached and detached.

  In the following description, the term “optical path” refers to the optical path of the subject luminous flux incident through the photographing lens when the photographing lens is attached to the body mount 11. If there are exceptions, state that fact.

  A mirror box 12 is disposed on the rear side of the optical path of the body mount 11, and a main mirror 13 which is a movable reflection mirror and a main reflection mirror constituting the reflection mirror mechanism 2 and a sub-reflection are disposed in the mirror box 12. A sub mirror 14 or the like, which is a mirror, is provided. Further, as shown in FIG. 2, the mirrors 13 and 14 of the reflection mirror mechanism 2 are driven up on one side of the outer wall of the mirror box 12 (in this embodiment, the right side facing the front of the camera 1). A drive motor 20 that is a drive source for performing the shutter drive and the shutter charge drive of the shutter device 15 at the same time, and a power transmission mechanism that transmits the drive force of the drive motor 20 to the reflection mirror mechanism 2 and the shutter device 15. And a mirror drive and shutter charge device (hereinafter abbreviated as a mirror drive device) configured to include a mirror bound suppression mechanism 50 that is driven in conjunction with the power transmission mechanism and suppresses the mirror bound of the reflection mirror mechanism 2. ) 10 is provided.

  The mirror driving device 10 is not shown in FIG. 1, but refer to FIG. The detailed configuration of the mirror driving device 10 will be described later (see FIGS. 3 to 6).

  Of the constituent members of the reflecting mirror mechanism 2, the main mirror 13 is a plate-like member having a reflecting surface on one side, and is held by the main mirror holding frame 13x. One end edge of the main mirror holding frame 13x is pivotally supported around the rotation shaft 13c with respect to a fixed portion inside the mirror box 12. Accordingly, the main mirror 13 is rotated within a predetermined range in the direction of the arrow R1 in FIG. 1 while being held by the main mirror holding frame 13x.

  The main mirror 13 is configured to have a semi-transmissive portion on at least a part of the reflecting surface.

  On the other hand, among the constituent members of the reflection mirror mechanism 2, the sub mirror 14 is formed of a plate-like member having a total reflection surface on one surface, and is held by the sub mirror holding frame 14x. One side of the outer peripheral edge of the sub-mirror holding frame 14x rotates the main mirror 13 with respect to a fixed part (not shown) on the back side of the main mirror 13 so as to be rotatable relative to the main mirror 13. The shaft is supported via a rotation shaft 14b (see FIGS. 7 and 8) parallel to the shaft 13c. Thereby, the sub mirror 14 is rotated within a predetermined range about the rotation shaft 14b in the direction of arrow R2 in FIG. 1 while being held by the sub mirror holding frame 14x.

  In addition, the main mirror 13 and the sub mirror 14 which comprise the reflective mirror mechanism 2 are the observation position (code | symbols 13 and 14) shown as a continuous line in FIG. 1, and the retraction | saving position (code | symbols 13a and 14a) shown by the dashed-two dotted line in FIG. It is provided so that rotation movement is possible.

  That is, in a state where the mirrors 13 and 14 of the reflection mirror mechanism 2 are at the observation position, the main mirror 13 passes through the photographing lens (not shown) from the subject side and enters the optical path of the subject luminous flux that enters the mirror box 12. On the other hand, it is inclined on the optical path with an inclination of about 45 degrees. Further, in this state, that is, in a state where the main mirror 13 is at the observation position, the sub mirror 14 is arranged so as to be opened with a predetermined angle of inclination with respect to the main mirror 13. The state of the sub mirror 14 at this time is referred to as a first state.

  At this time, the reflection surface of the main mirror 13 and the total reflection surface of the sub mirror 14 are arranged toward the photographing lens, that is, toward the front of the camera 1.

  Thereby, when the main mirror 13 is in the observation position, the subject luminous flux that has passed through the photographing lens from the subject side and is incident is reflected by the reflecting surface, and its optical path is bent and guided to the finder unit 4 side. A part of the subject luminous flux is transmitted from the semi-transmissive portion and is moved straight toward the sub-mirror 14 side. The sub-mirror 14 reflects the subject light beam that has passed through the semi-transmissive portion of the main mirror 13 and travels straight on the total reflection surface, bends its optical path, and is disposed on the bottom side of the camera 1. It leads to the side of 5.

  On the other hand, in a state where the mirrors 13 and 14 of the reflecting mirror mechanism 2 are in the retracted position, the subject luminous flux that passes through the photographing lens from the subject side and enters the mirror box 12 travels straight on the optical path of the mirror box 12. It is guided to the side of the imaging unit 3 arranged behind. At this time, the reflecting mirror mechanism 2 blocks the light beam incident on the finder unit 4. Further, in this state, that is, in a state where the main mirror 13 is in the retracted position, the sub mirror 14 is disposed so as to overlap the main mirror 13 on the back surface of the main mirror 13. The state of the sub mirror 14 at this time is referred to as a second state.

  The sub mirror 14 rotates relative to the main mirror 13 between the first state (the state where the main mirror 13 is at the observation position) and the second state (the state where the main mirror 13 is at the retracted position). The main mirror 13 is pivotally supported by a fixed portion (not shown) on the back side so that it can be used.

  A peripheral edge including at least one of the other peripheral edges orthogonal to one side of the peripheral edge parallel to the axis of the rotating shaft 14b in the outer peripheral edge of the sub mirror holding frame 14x that holds the sub mirror 14. A sub mirror lever 62 having an engaged portion 62a (cam surface) to which an engaging pin 52c, which is an engaging member of an SMB lever 52 of a mirror bound prevention mechanism 50, which will be described later, is engaged is fixedly provided on the portion. . The sub mirror lever 62 is provided in order to suppress mirror bounce that occurs when the main and sub reflection mirrors 13 and 14 of the reflection mirror mechanism 2 are in the first state.

  That is, the sub mirror lever 62 is disposed integrally with the sub mirror holding frame 14 x of the sub mirror 14. When the mirror-down operation is performed at a predetermined timing and the sub-mirror 14 and the sub-mirror holding frame 14x are in the mirror-down state, the SMB lever of the mirror bounce suppression mechanism 50 described later is engaged with the engaged portion 62a of the sub-mirror lever 62. 52 engagement pins 52c are configured to engage with each other.

  Thereby, when the engaging pin 52c is engaged with the engaged portion 62a, the sub mirror 14 and the sub mirror holding frame 14x are immediately held in the mirror down state.

  Therefore, as shown in FIG. 8 (see also FIG. 20 and FIG. 21), the engaged portion 62a has a substantially U-shaped concave shape having a substantially arc shape at the portion receiving the engaging pin 52c and having a slope portion. Is formed. In this case, the arc-shaped portion of the engaged portion 62a is, for example, slightly larger than the outer peripheral arc shape of the engaging pin 52c, and is formed to have a gap with the outer periphery of the engaging pin 52c. . Thus, if the outer shape of the engaged portion 62a and the engaging pin 52c is devised and configured, the engaged state of both can be performed more reliably, contributing to the improvement of the mirror bounce suppression effect. Will do.

  A shutter device 15 including a shutter mechanism for controlling the passage time of the subject light flux and a shutter control mechanism for performing opening / closing control of the shutter mechanism is disposed behind the mirror box 12 in the optical path.

  As described above, when the reflection mirror mechanism 2 is in the retracted position, when the shutter mechanism of the shutter device 15 is opened, the incident subject luminous flux is further arranged on the rear side of the optical path. The light receiving surface of the imaging element 16 is irradiated.

  In the camera 1 according to the present embodiment, for example, a shutter device 15 configured to include a focal plane shutter curtain (not shown) is applied. Therefore, the shutter device 15 is shown as a unit configured to include a shutter control mechanism 15b (see FIG. 3 and the like described later) for driving the shutter curtain.

  As described above, the imaging unit 3 is disposed behind the shutter device 15 on the optical path. The image pickup unit 3 includes an image pickup device 16 and an electric board on which a circuit for performing various signal processing on an image signal acquired by the image pickup device 16 is mounted.

  Above the mirror box 12, the finder unit 4 constituting the observation optical system is disposed. The finder unit 4 includes a focusing screen 17 formed so that a subject image is formed, a pentaprism 18 for converting the subject image formed on the focusing screen 17 into an erect image, and the pentagon. An eyepiece optical system 19 for enlarging an optical image from the prism 18 and guiding it to the eyes of the observer is formed.

  The finder unit 4 is disposed on the optical path of the subject light beam reflected by the main mirror 13 in a state where the mirrors 13 and 14 of the reflection mirror mechanism 2 are at the observation position. Further, the focusing screen 17 of the finder unit 4 is disposed at a position optically equivalent to the imaging element 16 with respect to the photographing lens. Therefore, an image formed on the focusing screen 17 with the reflection mirror mechanism 2 in the observation position, and an image formed on the light receiving surface of the image sensor 16 with the reflection mirror mechanism 2 in the retracted position. Each member arrangement is defined so that an optically equivalent image is obtained.

  Above the finder unit 4, a strobe unit 7, which is a flash light emitting device for irradiating auxiliary illumination light toward a subject, is disposed. The strobe unit 7 is in a pop-up state when used, and is configured to be retractable so that it can be stored inside the camera 1 when not in use. The state shown in FIG. 1 is a state in which the strobe unit 7 is not in use and the strobe unit 7 is stored in the camera 1.

  On the bottom side of the mirror box 12, a distance measuring unit 5 which is a focus detection device using a phase difference detection method is disposed. The distance measuring unit 5 is disposed on the optical path of the subject light flux reflected by the sub-mirror 14 after passing through the semi-transmissive portion of the main mirror 13 with the mirrors 13 and 14 of the reflecting mirror mechanism 2 being at the observation position. ing.

  The distance measuring unit 5 includes a condenser lens 21 that collects incident light, a first mirror 22, a second mirror 23, a separator lens 24, a distance measuring sensor 25, and the like.

  On the back side of the camera 1, a display unit 6 including various types of color liquid crystal display elements and various operation members 27 (see FIG. 2) are disposed.

  Next, the configuration around the mirror box 12 in the camera 1 of the present embodiment, in particular, the detailed configuration of the mirror driving device 10 will be described below mainly with reference to FIGS.

  As described above, the mirror driving device 10 in the camera 1 of the present embodiment is disposed on one side surface of the outer wall of the mirror box 12 (in the present embodiment, the right side surface facing the front of the camera 1). The mirror driving device 10 is configured to drive the main mirror 13 and the sub mirror 14 of the reflecting mirror mechanism 2 up or down, and drive the shutter device 15 as a driving source for driving the shutter device 15. A power transmission mechanism that transmits the driving force to the reflection mirror mechanism 2 and the shutter device 15, a mirror bound suppression mechanism 50 that is driven in conjunction with the operation of the power transmission mechanism, and suppresses mirror bounds of the reflection mirror mechanism 2, and the like. It is configured to include.

  That is, in this camera 1, the driving force of one drive motor 20 is used to drive up and down each mirror 13, 14 of the reflection mirror mechanism 2, shutter charge drive of the shutter device 15, and the reflection mirror mechanism 2. When each mirror 13, 14 is in the observation position, a mirror bound restraining operation for restraining the mirror bound by stopping the movement of the sub mirror 14 can be performed by a series of operations.

  That is, the power transmission mechanism of the mirror drive device 10 includes a gear box 20a, an output gear 20aa, a charge gear 31, a drive lever 32, a mirror up spring 33 that is a second urging spring, and a first attachment. It includes a mirror down spring 34 that is a force spring, a mirror up / down lever 35, a mirror hook lever 36 that is a locking lever, a hook lever locking spring 37, a shutter charge lever 38, and the like.

  The gear box 20a is a unit composed of a plurality of gears and the like. An output shaft (not shown) of the drive motor 20 is connected to the gear box 20a. The gear box 20a serves to receive the driving force of the driving motor 20, decelerate the driving force, and change the output direction of the driving motor 20.

  An output gear 20aa is connected to the gear box 20a. The output gear 20aa serves to extract the drive output of the drive motor 20 that has been decelerated and output direction changed by the gear box 20a.

  In addition, the drive motor 20 and the gear box 20a are unitized in a connected state, and this unit is, for example, with respect to a gear box support 20b attached to a predetermined portion on the outer surface of the side plate 61 of the mirror box 12. It is fixedly supported by a connecting member such as a screw. In the present embodiment, the drive motor 20 is arranged at a position outside the shutter control mechanism 15b of the shutter device 15 (see FIGS. 3 and 5).

  The charge gear 31 is rotatably supported by a support shaft 12b planted on the side plate 61 of the mirror box 12. The charge gear 31 has a gear portion that meshes with the output gear 20aa on the outer peripheral side. That is, when the output gear 20aa meshes with the gear portion of the charge gear 31, the driving force of the drive motor 20 is transmitted to the charge gear 31. The drive motor 20 rotates only in one direction. Therefore, the charge gear 31 also rotates only in one direction (in this embodiment, counterclockwise when viewed from the side of the mirror box 12; the direction of the arrow R4 in FIG. 9).

  In addition, when one surface of the charge gear 31, that is, when the charge gear 31 is attached to the side plate 61 of the mirror box 12, the surface on the side facing the wall surface of the side plate 61 has a thickness in the direction of the rotation axis of the charge gear 31. A cam 31a (not shown in FIGS. 3 to 6; see FIG. 9). In the drawing, the cam 31a is shown through the charge gear 31. ) And a hook release boss 31b (FIG. 3 etc.) extending on the same surface on which the cam 31a of the charge gear 31 is formed and extending away from the cam 31a along the rotation axis of the charge gear 31. Reference) is formed.

  The cam 31 a is a member that is a basic component of the mirror driving device 10. The cam 31a has a predetermined cam shape so as to act on a drive lever 32 that performs mirror driving and charge driving, and drives the reflecting mirror mechanism 2 and the shutter device 15 at a desired timing, as will be described later. Is formed.

  The maximum cam diameter of the cam 31 a extends to the vicinity of the tooth bottom of the charge gear 31. The hook release boss 31 b is also set up near the tooth bottom of the charge gear 31. The cam 31a and the hook release boss 31b are formed with substantially the same thickness and height in the rotation axis direction of the charge gear 31, and a cam follower 32a described later passes between the cam 31a and the hook release boss 31b. It is formed as follows.

  More specifically, as will be described later, simply speaking, the cam 31 a rotates the drive lever 32 in the shutter charging direction while maintaining the down state of the main mirror 13 against the urging force of the mirror up spring 33. It functions as a charge contact portion to be moved. Further, the hook release boss 31 b functions as a release contact portion for releasing the engagement between the mirror hook lever 36 and the mirror up / down lever 35.

  The cam follower 32a of the drive lever 32 is in contact with the cam 31a of the charge gear 31. The drive lever 32 is a substantially plate-like member provided for shutter charge driving and mirror up / down driving of the main mirror 13.

  The drive lever 32 is planted in a direction perpendicular to the plane of the drive lever 32 at the rotation base shaft portion 32c serving as a rotation center and the tip of one arm portion formed extending from the rotation base shaft portion 32c. A cam follower 32a having an axial shape provided, and a locking portion 32b that is formed so as to protrude in the same direction as the cam follower 32a at a middle portion of the same arm portion, and to which one end of the mirror up spring 33 is locked. It is formed.

  The drive lever 32 is arranged in parallel to the wall surface of the side plate 61 of the mirror box 12, and is a rotation shaft implanted in the side plate 61 so as to be reciprocally rotatable within a plane along the side plate 61. Is supported by another support shaft 12c.

  A mirror up / down lever 35 for rotating the main mirror 13 in the up direction is pivotally supported on the support shaft 12c between the drive lever 32 and the side plate 61 so as to be reciprocally rotatable. Further, on the outer surface of the drive lever 32, there is provided a mirror up spring 33 which is a second urging spring that urges the drive lever 32 to rotate in a predetermined direction (a direction in which the main mirror 13 is raised). The mirror-up spring 33 is wound around the rotation base shaft portion 32c of the drive lever 32 that is pivotally supported by the support shaft 12c.

  That is, the support shaft 12 c implanted in the side plate 61 is pivotally supported in the order of the mirror up / down lever 35 and the drive lever 32, and the mirror up spring 33 is wound around the rotation base shaft portion 32 c of the drive lever 32. ing.

  A screw 39 is screwed onto the support shaft 12c to prevent the mirror up spring 33, the drive lever 32, and the mirror up / down lever 35 from falling off at the distal end side of the rotation base shaft portion 32c of the drive lever 32. ing. That is, the screw 39 restricts the movement of the mirror up spring 33, the drive lever 32, and the mirror up / down lever 35 in the respective axial directions, and allows the movement of these members in the rotational direction. ing.

  Thus, when the charge gear 31 rotates in a predetermined direction (counterclockwise with respect to the side plate 61; arrow R4 direction in FIG. 9), the cam follower of the drive lever 32 along the cam surface of the cam 31a that rotates in the same direction. By the relative movement of 32a, the drive lever 32 is controlled to rotate at a predetermined timing with the support shaft 12c as the rotation center.

  As described above, the mirror up spring 33 is wound around the rotation base shaft portion 32c of the drive lever 32 pivotally supported by the support shaft 12c, and one end of the mirror up spring 33 is locked to the locking portion 32b of the drive lever 32. The other end is locked to a fixing portion (groove) 12e (see FIG. 6) of the side plate 61 of the mirror box 12. Therefore, when viewed from the side toward the side plate 61, the mirror up spring 33 urges the drive lever 32 to rotate counterclockwise around the support shaft 12c.

  A pin 40 is fixed to the drive lever 32 at a predetermined position 32d that is different from the rotation base shaft portion 32c that is the center of the support shaft, and in the middle of the other arm portion, and the mirror hook lever 36 is The pin 40 is pivotally supported around the rotation center.

  A hook lever locking spring 37, which is a locking spring that urges the mirror hook lever 36 to rotate in a predetermined direction (a direction in which the mirror hook lever 35 is engaged with the mirror up / down lever 35), is wound around the pin 40. Note that one end of the hook lever locking spring 37 is locked to the locking portion 36 c and the other end is locked to the locking portion 38 b of the shutter charge lever 38. Thus, when viewed from the side toward the side plate 61, the hook lever locking spring 37 is pivoted counterclockwise (same as the arrow R4 in FIG. 9) with the mirror hook lever 36 as the pivot center. It is fast.

  The mirror hook lever 36 is a locking lever for maintaining the main mirror 13 in the up state or releasing the state. The mirror hook lever 36 includes a hook portion 36a for rotating the mirror up / down lever 35 in a predetermined direction by engaging with or releasing the engagement boss 35b of the mirror up / down lever 35, and a charge. A follower portion 36b that abuts on the hook release boss 31b of the gear 31 as appropriate is formed.

  Further, on the plane of the drive lever 32, the shutter charge lever 38 is fixed using connection means (not shown) such as a screw so as to be integrated with the drive lever 32. The shutter charge lever 38 has a convex shutter charge portion 38 a and a locking portion 38 b that locks the other end of the hook lever locking spring 37 and is made of synthetic resin.

  The shutter charge unit 38a is a part that is rotatably provided at a predetermined part of the shutter device 15 and acts on a shutter set lever 15a that sets the shutter mechanism of the shutter device 15 to perform a shutter charge drive. The shutter charge unit 38a presses the shutter set lever 15a of the shutter device 15 at a predetermined timing to drive the shutter charge of the shutter device 15.

  On the other hand, the other support shaft 12d planted on the side plate 61 of the mirror box 12 is a mirror that is a first urging spring that imparts a rotational urging force to urge the main mirror 13 in a predetermined down direction. A down spring 34 is wound. One end 34a of the mirror down spring 34 is locked to the fixing portion 12f of the side plate 61 of the mirror box 12 (see FIG. 9 and the like), and the other end 34b (see FIG. 3) is locked to the mirror drive rod 13b. ing. The mirror driving rod 13b is formed so as to extend from the main mirror 13 toward the side plate 61 side of the mirror box 12 and project outside the side plate 61 through the hole 61b of the side plate 61. Yes. The mirror driving rod 13 b is in contact with the lever portion 35 a of the mirror up / down lever 35.

  Therefore, with this configuration, the mirror down spring 34 engages with the mirror driving rod 13b to urge the main mirror 13 in the down direction, and the support shaft 12c is viewed from the side toward the side plate 61. The mirror up / down lever 35 is urged via the mirror drive rod 13b so as to rotate in the clockwise direction about the rotation center.

  On the other hand, on the outer surface side of each constituent member of the power transmission mechanism in the mirror driving device 10, a thin plate-like plate 41 is disposed so as to cover these members. The pressing plate 41 is fixed to a fixing portion of the side plate 61 of the mirror box 12 by fixing means such as screws. In this case, the fly board 41 is disposed so as to cover the outer surfaces of these constituent members while preventing the operation of the power transmission mechanism and ensuring a reliable operation. As a result, the pressing plate 41 falls off in the direction along the supporting shaft on which the charge transmission gear 31 is supported, that is, the direction orthogonal to the side plate 61 of the mirror box 12. Is preventing.

  Furthermore, the mirror driving device 10 according to the present embodiment is configured to include a mirror bound suppression mechanism 50 that is driven in conjunction with the operation of the power transmission mechanism and suppresses the mirror bound of the reflection mirror mechanism 2. The details of the configuration of the mirror bound prevention mechanism 50 are mainly shown in FIGS. 3, 7, and 14 to 19 (see also FIGS. 4 to 6 and FIGS. 9 to 13).

  The mirror bound suppression mechanism 50 includes a sub mirror bound suppression cam (hereinafter abbreviated as an SMB cam. In FIGS. 9 to 13, the charge gear 31 is transmitted) 51 and a sub mirror bound suppression lever (hereinafter referred to as an SMB). A sub mirror bound restraining spring (hereinafter abbreviated as SMB spring) 53, a sub mirror bound restraining lever support shaft (hereinafter abbreviated as SMB lever shaft) 54, a lever locking member 55, A lever locking member support shaft 56, a lever locking spring 57, and the like are included. Each component of the mirror bound prevention mechanism 50 is disposed in an operable state in the space between the charge gear 31 and the side plate 61 of the mirror box 12. Further, a hole 61d is formed in the side plate 61 in the vicinity of a portion facing the position where the mirror bound prevention mechanism 50 is disposed. The hole 61d connects a predetermined component of the mirror bound prevention mechanism 50 (engagement pin 52c of the SMB lever 52) and a predetermined component of the reflection mirror mechanism 2 (the engaged portion 62a of the sub mirror lever 62). This is provided for this purpose (details will be described later).

  The SMB cam 51 is rotatably supported by a support shaft 12b planted on the side plate 61. As described above, the support shaft 12b is a rotating shaft that rotatably supports the charge gear 31 as well. Therefore, the SMB cam 51 and the charge gear 31 rotate in the same direction around the support shaft 12b. At this time, the SMB cam 51 and the charge gear 31 are held by the charge gear 31 so as to integrally surround the support shaft 12b so that the relative positional relationship does not change. On the outer peripheral surface of the SMB cam 51, a cam portion (cam peripheral surface) 51a that continuously changes in the radial direction is formed. A cam follower 52b described later of the SMB lever 52 is in contact with the cam portion 51a.

  The SMB lever 52 is a swing lever having a substantially L shape. The SMB lever 52 includes a rotation base (hole) 52a serving as a rotation center, a cam follower 52b provided at the tip of one arm, and a hole 61d side of the side plate 61 provided near the tip of the other arm. A protruding engaging pin 52c (engaging member) and a locking portion 55b of a lever locking member 55, which will be described later, are formed at the foremost portion of the other arm to lock the rotation of the SMB lever. 52d to be engaged.

  The engagement pin 52c is disposed so as to pass through the hole 61d of the side plate 61 and protrude into the mirror box. In this case, as the SMB lever 52 rotates, the engagement pin 52c also reciprocates (that is, swings) within a predetermined range, so that the hole 61d of the side plate 61 has a swing range of the engagement pin 52c. A predetermined area enough to allow the above is secured.

  An SMB lever shaft 54 implanted in the side plate 61 is inserted into the rotation base 52 a of the SMB lever 52. Thus, the SMB lever 52 is pivotally supported by the SMB lever shaft 54 with the rotation base 52a as the rotation center.

  An SMB spring 53 is wound around the SMB lever shaft 54. One end of the SMB spring 53 is locked to the middle portion of the other arm portion of the SMB lever 52, and the other end is locked to a locked arm portion 61 a provided on the side plate 61. Accordingly, the SMB spring 53 biases the SMB lever 52 in the direction of the arrow R10 in FIG. 7 with the SMB lever shaft 54 as the center of rotation. The urging force of the SMB spring 53 acts so that the cam follower 52b of the SMB lever 52 is brought into contact with the cam portion 51a of the SMB cam 51.

  An E-ring 54 a for preventing the SMB lever 52 and the SMB spring 53 from falling off the SMB lever shaft 54 is disposed at the tip of the SMB lever shaft 54.

  The lever locking member 55 is provided to hold the rotational biasing force of the SMB lever 52 by the SMB cam 51 and the SMB spring 53 for a predetermined period and to release at a predetermined timing.

  The lever locking member 55 includes a rotation base portion (hole) 55a that serves as a rotation center, a locking portion 55b that is provided at the tip of one arm portion and abuts a locked portion 52d of the SMB lever 52, and the other arm portion. Are formed with a pressed portion 55d and the like which are formed on the outer peripheral edge portion of the mirror up / down lever 35 and contact the pressing portion 35c of the mirror up / down lever 35.

  A lever locking member support shaft 56 planted on the side plate 61 is inserted into the rotation base 55 a of the lever locking member 55. Accordingly, the lever locking member 55 is pivotally supported by the lever locking member support shaft 56 with the rotation base 55a as the rotation center.

  A lever locking spring 57 is wound around the lever locking member support shaft 56. One end of the lever locking spring 57 is locked to a middle portion of one arm portion of the lever locking member 55, and the other end is provided on the side plate 61 and projects in a direction perpendicular to the plane of the side plate 61. The support shaft 12c is engaged with the root 61a. Thereby, the lever locking spring 57 urges the lever locking member 55 in the direction of arrow R15 in FIG. 14 (clockwise in FIG. 14) with the lever locking member support shaft 56 as the center of rotation. The biasing force of the lever locking spring 57 acts in a direction in which the pressed portion 55d of the lever locking member 55 is brought into contact with the pressing portion 35c of the mirror up / down lever 35.

  An E-ring 56 a for preventing the lever locking spring 57 from falling off is disposed at the tip of the lever locking member support shaft 56.

  Of the operations in the camera 1 of the present embodiment configured as described above, operations of the mirror driving device 10 including the mirror bound suppression mechanism 50 will be described below with reference to FIGS. 9 to 21.

  9 to 13 are plan views showing the right side as viewed from the front of the mirror driving device of the camera of the present embodiment. 14 to 19 are views showing only the left side surface (the surface on the side facing the side plate) of the mirror driving device 10 taken out of the structural members related to the mirror bound prevention mechanism 50. FIG.

  Specifically, FIG. 9 shows a state where the reflection mirror mechanism 2 is in the mirror-down state and the mirror bound suppression mechanism 50 is functioning (charge complete state). That is, it is a state immediately before the mirror up operation by the mirror driving device is performed. This state is the initial state of the mirror driving device 10.

  FIG. 10 shows a state immediately after the reflecting mirror mechanism 2 starts the mirror up operation after the state of FIG.

  FIG. 11 shows a state where the mirror-up operation of the reflecting mirror mechanism 2 is completed after the state of FIG. That is, it is a state immediately before the mirror down operation is performed.

  FIG. 12 shows a state immediately after releasing the locking of the mirror hook lever during the mirror down operation after the state of FIG. Moreover, the state at the time of the latching state of the SMB lever 52 of the mirror bound prevention mechanism 50 being cancelled | released by the start of the mirror down operation | movement of the reflective mirror mechanism 2 is shown.

  FIG. 13 shows a state immediately after the mirror down operation is completed after the state of FIG. 12 and immediately before the shutter charge operation is started.

FIG. 14 shows the same state as FIG. 9 and shows a state immediately before the SMB lever 52 is locked. This state is the initial state for the mirror bound suppression mechanism.

  FIG. 15 shows the same state as FIG. 10 and shows a state immediately after the SMB lever 52 is locked after the state of FIG.

  FIG. 16 shows the same state as FIG. 13 and shows a state immediately after the SMB lever starts operating after the state of FIG.

  FIG. 17 shows a state where the SMB lever is further operated after the state of FIG. 16 and the SMB lever and the cam are in contact with each other.

  FIG. 18 shows a state in which the cam starts operating after the state of FIG.

  FIG. 19 shows a state after the cam is operated after the state of FIG.

  First, when the camera 1 is in a normal state, the main mirror 13 and the sub mirror 14 of the reflection mirror mechanism 2 are at the observation positions (reference numerals 13 and 14) indicated by solid lines in FIG. The state of the reflection mirror mechanism 2 at this time is called a mirror down state.

  When the reflecting mirror mechanism 2 is in the mirror-down state, the main mirror 13 reflects the subject luminous flux that has passed through the photographing lens from the subject side and is incident on the reflecting surface and guides it to the viewfinder unit 4 side. Thereby, the user can observe the subject image using the finder unit 4. At this time, part of the subject luminous flux passes through the semi-transmissive portion of the main mirror 13 and travels straight and is irradiated onto the sub mirror 14. In response to this, the sub mirror 14 reflects the subject light flux on the reflecting surface and guides it to the distance measuring unit 5 side. As a result, when the user performs a predetermined operation for performing the distance measuring operation while the reflecting mirror mechanism 2 is in the mirror down state, the control circuit of the camera 1 (particularly not shown) receives the operation instruction signal. Z) drives and controls the distance measuring unit 5. Thereby, a predetermined distance measuring operation by the distance measuring unit 5 is executed.

  When the reflection mirror mechanism 2 of the camera 1 is in the mirror down state, the shutter control mechanism of the shutter device 15 is in a state where the shutter charge is completed.

  The state of each component of the power transmission mechanism of the reflecting mirror mechanism 2 in the mirror driving device 10 when in the mirror down state is as shown in FIG. Moreover, the state of each structural member of a mirror bound suppression mechanism is as showing in FIG.9 and FIG.14 (initial state).

  9, the cam follower 32a of the drive lever 32 is in contact with the cam surface of the cam 31a of the charge gear 31. At this time, the cam follower 32a is in a state of being pressed by the cam 31a in the direction along the arrow R3 in FIG. Therefore, the drive lever 32 in this state is urged clockwise (in the direction of arrow R3) in FIG. 9 with the support shaft 12c as the rotation center against the urging force of the mirror up spring 33.

  At the same time, the mirror hook lever 36 disposed on the drive lever 32 is urged counterclockwise in FIG. 9 by the hook lever locking spring 37 with the pin 40 as the center of rotation. Therefore, at this time, the locking boss 35b of the mirror up / down lever 35 is engaged with the hook portion 36a of the mirror hook lever 36. However, at this time, the amount of rotational force by the hook portion 36a does not act on the locking boss 35b.

  In this state, the cam follower 52 b of the SMB lever 52 is in contact with the cam portion 51 a of the SMB cam 51. At this time, the cam follower 52b is in a state of being pressed by the cam portion 51a in the direction along the arrow R11 in FIG. Accordingly, the SMB lever 52 in this state is pressed clockwise (in the direction of arrow R11) in FIG. 14 with the SMB lever shaft 54 as the rotation center against the urging force of the SMB spring 53.

  In the mirror down state shown in FIG. 9, when the charge gear 31 rotates about the support shaft 12b in the direction of arrow R4 in FIG. 9 (counterclockwise in FIG. 9), the power transmission mechanism of the reflection mirror mechanism 2 is Transition to the state shown in FIG.

  In the state shown in FIG. 10, the cam follower 32 a of the drive lever 32 is in a state where the cam follower 32 a of the charge gear 31 has fallen into the stepped portion 31 aa of the cam surface. Thus, the drive lever 32 is rotated in the direction along the arrow R5 in FIG. 10 (counterclockwise in FIG. 10) about the support shaft 12c by the urging force of the mirror up spring 33.

  As the drive lever 32 rotates, the hook portion 36a of the mirror hook lever 36 maintains the engaged state with the locking boss 35b of the mirror up / down lever 35 in the same direction as the drive lever 32 (FIG. 10). In the counterclockwise direction).

  Accordingly, the mirror up / down lever 35 is also rotated in the direction along the arrow R5 in FIG. 10 (counterclockwise in FIG. 10) with the support shaft 12c as the rotation center. Here, the mirror drive rod 13b of the main mirror 13 is in contact with the lever portion 35a of the mirror up / down lever 35 by the urging force of the mirror down spring 34. Therefore, as described above, when the mirror up / down lever 35 rotates in the direction along the arrow R5 in FIG. 10 (counterclockwise in the figure), the lever portion 35a moves in the direction along the arrow R6 in FIG. ). Thereby, the lever part 35a pushes up the main mirror 13 in the up direction via the mirror drive rod 13b against the urging force of the mirror down spring 34. The urging force of the mirror up spring 33 is set stronger than the urging force of the mirror down spring 34.

  As the main mirror 13 is displaced to the mirror-up state, the sub-mirror 14 is also displaced to the mirror-up state. That is, the mirrors 13 and 14 of the reflection mirror mechanism 2 are displaced to the retracted positions (reference numerals 13a and 14a) indicated by the two-dot chain line in FIG. The state of the reflection mirror mechanism 2 at this time is called a mirror-up state.

  This mirror up state is when the power transmission mechanism in the mirror driving device 10 is in the state shown in FIG. 10, that is, the engagement state between the hook portion 36a of the mirror hook lever 36 and the locking boss 35b of the mirror up / down lever 35. Is maintained.

  On the other hand, when the charge gear 31 rotates as described above in the process in which the reflecting mirror mechanism 2 shifts from the state of FIG. 9 to the state of FIG. 10, the SMB cam 51 also rotates in the same direction. Therefore, the SMB cam 51 rotates in the direction of arrow R12 in FIG. 14 (clockwise in FIG. 14). Thereby, the mirror bound suppression mechanism 50 shifts to the state shown in FIG.

  At the time of this transition, as described above, the drive lever 32 is rotated by the rotation of the charge gear 31, and along with the rotation, the mirror up / down lever 35 is moved in the same direction as the drive lever 32 (via the mirror hook lever 36). It is rotated counterclockwise in FIG.

  As a result, the mirror up / down lever 35 rotates about the support shaft 12c in the direction along the arrow R5 in FIG. 10 (counterclockwise in FIG. 10). The rotation of the mirror up / down lever 35 is indicated by an arrow R13 direction (clockwise direction in FIG. 14) with the support shaft 12c as the rotation center in FIG.

  Thus, when the mirror up / down lever 35 rotates in the direction of arrow R13 (clockwise in the figure) in FIG. 14, the lever portion 35a of the mirror up / down lever 35 is also supported in the same direction (indicated by arrow R14 in FIG. 14). The shaft 12c rotates about the rotation center. Thereby, the pressing part 35c of the mirror up / down lever 35 and the pressed part 55d of the lever locking member 55 are separated from each other, and the contact state between them is released. Then, the lever locking member 55 starts rotating around the lever locking member support shaft 56 in the direction of arrow R15 in FIG. 14 by the urging force of the lever locking spring 57. As shown in FIG. 15, the locking portion 55 b of the locking member 55 comes into contact with the locked portion 52 d of the SMB lever 52 and locks it. Accordingly, the rotation of the lever locking member 55 in the direction of the arrow R15 in FIGS. 14 and 15 by the urging force of the lever locking spring 57 is restricted by the locked portion 52d of the SMB lever 52.

  Thus, after the locked portion 52d of the SMB lever 52 and the locking portion 55b of the lever locking member 55 come into contact with each other, the charge gear 31 further rotates in the same direction, and in conjunction with this, the SMB When the cam 51 continues to rotate in the same direction (the direction of the arrow R12 in FIG. 14), the cam follower 52b of the SMB lever 52 that is in contact with the cam portion 51a of the SMB cam 51 moves along with the rotation of the SMB cam 51. 51a, the cam follower 52b of the SMB lever 52 and the cam portion 51a of the SMB cam 51 are separated from each other, and the contact state between the two is released. The Thereafter, the state where the SMB cam 51 is further rotated is the state shown in FIG.

  As described above, when the contact state between the cam follower 52b of the SMB lever 52 and the cam portion 51a of the SMB cam 51 is released, the SMB lever 52 rotates the SMB lever shaft 54 around the rotation center by the urging force of the SMB spring 53. 15 to rotate in the direction of arrow R16 in FIG. 15 (counterclockwise in FIG. 15). As described above, at this time, the locking portion 55b of the lever locking member 55 is already locked to the locked portion of the SMB lever 52. 52d is locked. Accordingly, the state of the SMB lever 52 is maintained in the state shown in FIG. 15 until the mirror up / down lever 35 rotates again and the reflection mirror mechanism 2 enters the mirror down state, as will be described later.

  When the charge gear 31 further rotates counterclockwise in FIG. 10 from the mirror up start state of FIG. 10 with the support shaft 12b as the center of rotation, the state shifts to the state shown in FIG.

  In the state shown in FIG. 11, when the charge gear 31 slightly rotates counterclockwise in FIG. 10 from the state shown in FIG. 10, the hook release boss 31b of the charge gear 31 moves along a predetermined locus, and the mirror hook lever The state which contact | abutted to 36 follower parts 36b is shown. There is no change in other members.

  If the charge gear 31 further rotates counterclockwise in FIG. 11 from the state of FIG. 11, the state shifts to the state of FIG.

  In the state shown in FIG. 12, when the charge gear 31 is slightly rotated counterclockwise in FIG. 11, the hook release boss 31b of the charge gear 31 presses the follower portion 36b of the mirror hook lever 36. . Then, the mirror hook lever 36 slightly rotates in the direction along the arrow R7 in FIG. 12 (clockwise in FIG. 12) with the pin 40 as the rotation center against the urging force of the hook lever locking spring 37. As a result, the engagement state between the hook portion 36a of the mirror hook lever 36 and the locking boss 35b of the mirror up / down lever 35 is released. FIG. 12 shows a state immediately after the engagement state of both is released at this time.

  When the engagement state between the hook portion 36a and the locking boss 35b is released, the mirror up / down lever 35 enters a free state in the rotating direction. Then, the mirror drive rod 13 b of the main mirror 13 is pushed down by the urging force of the mirror down spring 34. Thereby, the mirror drive rod 13b of the main mirror 13 acts on the lever portion 35a of the mirror up / down lever 35, and the mirror up / down lever 35 is in a direction along R8 in FIG. (Clockwise in the figure).

  Thus, simultaneously with the release of the engaged state between the hook portion 36a and the locking boss 35b, the mirror down operation is started and the main mirror 13 is displaced to the mirror down state. At the same time, the sub mirror 14 is also displaced to the mirror down state. And each mirror 13 and 14 of the reflective mirror mechanism 2 is displaced to the observation position (code | symbols 13 and 14) shown as the continuous line of FIG. 1, ie, the mirror down state shown in FIG.

  As described above, when the mirror up / down lever 35 is rotated and disposed at the position shown in FIG. 13 from the state shown in FIG. 12, the mirror bound prevention mechanism 50 changes from the state shown in FIG. 15 to the state shown in FIG.

  That is, when shifting from the state of FIG. 12 to the state of FIG. 13, as described above, the mirror up / down lever 35 moves the mirror drive rod 13b of the main mirror 13 in the down direction by the urging force of the mirror down spring 34. Accordingly, it rotates clockwise in FIG.

  The rotation of the mirror up / down lever 35 at this time is shown as the rotation in the direction of arrow R17 in FIG. 15 (counterclockwise in FIG. 15) with the support shaft 12c as the center of rotation. By this rotation, the mirror up / down lever 35 shifts from the state of FIG. 15 to the state of FIG. At this time, the stopper end portion 35d provided at a position different from the lever portion 35a of the mirror up / down lever 35 contacts the wall 61h provided on the side plate 61, and the rotation of the mirror up / down lever 35 stops.

  When the mirror up / down lever 35 is thus rotated in the direction of the arrow R17 in FIG. 15, the pressing portion 35c of the mirror up / down lever 35 contacts the pressed portion 55d of the lever locking member 55. When the mirror up / down lever 35 further rotates in the same direction, the pressing portion 35c relatively moves along the pressed portion 55d while pressing the lever locking member 55 as shown in FIG. As a result, the lever locking member 55 moves in the direction of the arrow R18 in FIG. 16 (counterclockwise in FIG. 16) with the lever locking member support shaft 56 as the center of rotation against the biasing force of the lever locking spring 57. Rotate.

  When the lever locking member 55 rotates in the direction of arrow R18 in FIG. 16, the locked state of the locked portion 52d of the SMB lever 52 by the locking portion 55b of the lever locking member 55 is released. At this time, since the urging force of the SMB spring 53 acts on the SMB lever 52, the SMB lever 52 moves in the direction of the arrow R16 in FIG. 16 (counterclockwise in FIG. 16) with the SMB lever shaft 54 as the center of rotation. And turn. The rotation of the SMB lever 52 at this time is restricted by the cam follower 52b of the SMB lever 52 coming into contact with the cam portion 51a of the SMB cam 51. Thereby, the mirror bound suppression mechanism 50 shifts to the state shown in FIG. When the state shown in FIG. 17 is reached, the engaging pin 52c, which is the engaging member of the SMB lever 52, is covered by the sub mirror lever 62 formed integrally with the sub mirror holding frame 14x of the sub mirror 14 in the mirror down state. Engage with the engaging portion 62a. The positional relationship between the engaging pin 52c and the engaged portion 62a at this time is in an engaged state as shown in FIG. As a result, the sub mirror holding frame 14x of the sub mirror 14 is locked.

  Returning to FIG. 13, after the reflecting mirror mechanism 2 enters the mirror-down state, the charge gear 31 further rotates counterclockwise in FIG. 13 to start the shutter charging operation.

  That is, when the charge gear 31 rotates counterclockwise around the support shaft 12b in the state of FIG. 13, the cam 31a of the charge gear 31 acts on the cam follower 32a of the drive lever 32, and the drive lever 32 Is rotated clockwise in FIG. 13 with the support shaft 12c as the center of rotation. Then, the shutter charge lever 38 fixed integrally on the drive lever 32 also rotates in the same direction together with the drive lever 32. Accordingly, the shutter charge portion 38a of the shutter charge lever 38 moves in the direction along the arrow R19 in FIG. At this time, the shutter charge unit 38a presses the shutter set lever 15a of the shutter device 15 (not shown in FIG. 13, see FIGS. 4 and 5). Therefore, the shutter charge lever 38 drives the shutter set lever 15a in the charge direction (downward direction in the present embodiment; arrow X1 direction in FIG. 4) by the shutter charge portion 38a.

  As the charge gear 31 further rotates, the drive lever 32 eventually returns to the state shown in FIG. 10, that is, the state where the reflection mirror mechanism 2 is in the mirror down state and the shutter charge of the shutter control mechanism of the shutter device 15 is completed. . After the return to the state of FIG. 10, the series of operations described above is repeated at a predetermined timing as appropriate.

  On the other hand, in parallel with the shutter charge operation described above, the mirror bound suppression mechanism 50 performs the following operation.

  That is, when the reflecting mirror mechanism 2 is in the mirror down state (the state shown in FIG. 13), the mirror bound prevention mechanism 50 is in the state shown in FIG.

  When the charge gear 31 further rotates counterclockwise in FIG. 13 in the state shown in FIG. 17, the SMB cam 51 also rotates in the same direction in conjunction with this. At this time, the rotation direction of the SMB cam 51 is a clockwise rotation (in the direction of arrow R20 in FIG. 17) with the support shaft 12b as the rotation center in FIG. At this time, since the cam follower 52b of the SMB lever 52 is in contact with the cam portion 51a of the SMB cam 51, the cam follower 52b moves along the cam portion 51a and goes through the state of FIG. 18 to the state of FIG. And migrate. Meanwhile, the constituent members other than the SMB cam 51 among the constituent members of the mirror bound prevention mechanism 50 do not operate.

  When the charge gear 31 and the SMB cam 51 further rotate, the cam follower 52b of the SMB lever 52 eventually becomes a predetermined part on the cam surface of the cam part 51a of the SMB cam 51, that is, the cam surface of the cam part 51a is the small diameter part 51b. After reaching the part (large diameter part) 51c that is increased and displaced toward the outer diameter direction (the state shown in FIG. 19), after passing through this part, the cam portion 51a attaches the cam follower 52b to the SMB spring 53. The action of pressing against the power works. Thereby, the SMB lever 52 starts to rotate in the direction of arrow R11 in FIG. 19 (clockwise in FIG. 19) around the SMB lever shaft 54 according to the cam shape of the cam portion 51a with which the cam follower 52b is in contact. To do.

  The SMB lever 52 continues to rotate as the SMB cam 51 rotates, and returns to the state shown in FIG. After the return to the state of FIG. 14, the series of operations described above is repeated at a predetermined timing as appropriate.

  As described above, according to the above-described embodiment, the reflection mirror mechanism 2 (the main mirror 13 and the sub mirror 14) is driven up and down, and the mirror drive device 10 configured to perform the shutter charge drive at a predetermined timing. An SMB cam 51 that rotates in the same direction simultaneously with the rotation of the charge gear 31 is provided on the same axis as the support shaft 12b of the charge gear 31 that is a constituent member. The bounce suppression mechanism 50 is configured to be driven.

  The sub mirror lever 62 provided integrally with the sub mirror holding frame 14x of the sub mirror 14 is immediately locked at the timing when the reflection mirror mechanism 2 enters the mirror down state by the action of the mirror driving device 10. Mirror bounce that occurs when the reflecting mirror mechanism 2 enters the mirror-down state can be suppressed as early as possible.

  Here, as a configuration for locking the sub-mirror lever 62 when the reflecting mirror mechanism 2 is in the mirror-down state, the mirror bound suppression mechanism 50 is engaged with the engaged portion 62a provided on the sub-mirror lever 62. The engaging pin 52c of the SMB lever 52, which is one constituent member, is engaged. However, this engagement is set so that there is a slight gap between the cam surface of the engaged portion 62a and the engagement pin 52c when the reflecting mirror mechanism 2 is in a stable state, that is, in a stationary state. This is because each of the main mirror holding frame 13x and the sub mirror holding frame 14x is in contact with the positioning pin 61e and the positioning pin 61f shown in FIG. 1, and is set at a predetermined angle at an observation position which is a predetermined position in the optical path. This is because it is generally unreasonable that the reflecting mirror mechanism 2 is mechanically in contact with members other than those pins because of the so-called double dimensions in terms of mechanical dimensions. Of course, if the predetermined angle is not broken, it is not always necessary to provide the gap as in the present application.

  In this case, the engaged portion 62a is formed in a substantially U-shaped recess having a circular arc shape at a portion that receives the engaging pin 52c, and the circular arc shape is slightly more than the outer peripheral arc shape of the engaging pin 52c. It is formed so as to have a large shape, and a clearance is provided so that there is no contact with the engaging pin 52c in a stable state. As a result, the engaged state between the engaged portion 62a and the engaging pin 52c can be more reliably performed. Therefore, it can contribute to the further improvement of the mirror bound suppression effect.

  Further, in the stable state, that is, the stationary state, the sub mirror holding frame 14x is sandwiched by a part of the engaged portion 62a between the engaging pin 52c and the auxiliary pin 61g provided on the side plate 61. . Therefore, the sub mirror holding frame 14x is in the down state and is in contact with the positioning pin 61f, but is separated from the auxiliary pin 61g. Since there are these gaps, the sub-mirror holding frame 14x and the main mirror holding frame 13x are restrained from vibration in these gaps.

  In the present embodiment, a clearance is set between the engaging pin 52c and the engaged portion 62a in a stable state. However, as another embodiment, a soft impact is applied to the outer periphery of the engaging pin 52c. A member made of an absorbent material can be provided, and the setting can be made with this gap removed. According to this, not only can the sub-mirror holding frame 14x be set to a desired position by deformation of the shock absorbing material even in a stable state, but vibrations when the mirror is lowered can be absorbed more quickly by the shock absorbing material.

  Further, the mirror bounding mechanism 50 is connected to the mirror driving device 10 by utilizing a gap space between one outer wall surface of the side plate 61 of the mirror box 12 and the mirror driving device 10 so that the driving force can be taken out. Since various constituent members are skillfully arranged, the internal space of the camera 1 can be used effectively, thereby contributing to the miniaturization of the camera 1 itself.

  In addition, since the SMB cam 51 of the mirror bounce suppression mechanism 50 is provided coaxially with the charge gear 31 that rotates by receiving the driving force from the driving motor 20, the rotational driving force by the driving motor 20 passes through a complicated power transmission mechanism. Without being transmitted directly to the mirror bound prevention mechanism 50, it is possible to suppress the loss of driving force and contribute to simplification of the mechanism. In addition to the mirror charge, shutter charge, mirror up, and mirror down operations, the mirror bound deterrent mechanism 50 can be charged and locked simultaneously by only rotating one of them. Therefore, a series of operations necessary for the photographing operation of the camera 1 can be efficiently completed without increasing the number of parts and with a simple mechanism, and at the same time, it contributes to downsizing of the camera 1 itself. it can.

[Example]
In the camera 1 according to the above-described embodiment to which the present invention is configured as described above and the conventional type camera to which the present invention is not applied, when the mirror is lowered in each of the main mirror 13 and the sub mirror 14 of the reflection mirror mechanism 2. When the situation of the mirror bound was investigated by experiment, the experimental results as shown in FIGS. 22 and 23 could be obtained.

  FIG. 22 shows a mirror bound state of the main mirror. Here, the camera (1) of the above-described embodiment to which the present invention indicated by the solid line is applied is compared with the conventional camera indicated by the dotted line when the main mirror (13) is in the mirror-down state (see FIG. It can be seen that the mirror bounce that occurs after 22 point A) is immediately suppressed.

  FIG. 23 shows a mirror bound state of the sub mirror. Here, when the camera (1) of the above-described embodiment to which the present invention indicated by the solid line is applied is compared with the conventional camera indicated by the dotted line, the sub-mirror (14) is in the mirror-down state (FIG. 23). It can be seen that the mirror bounce that occurs after point B) is rapidly suppressed.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and applications can of course be implemented without departing from the spirit of the invention. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the effect of the invention Can be obtained as an invention.

1 is a longitudinal sectional view showing an internal configuration of a single-lens reflex camera according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the single-lens reflex camera in FIG. 1. The principal part expansion disassembled perspective view which takes out and decomposes | disassembles and shows the main structural unit of the single-lens reflex camera of FIG. The principal part expansion perspective view which shows the state which assembled the main structural unit of the single-lens reflex camera of FIG. FIG. 5 is a cross-sectional view taken along line [V]-[V] in FIG. 4. The principal part expansion perspective view which shows the state which removed one part structural member (a part of mirror drive and shutter charge apparatus, a shutter apparatus, etc.) from the main structural unit of the state of FIG. The principal part expansion perspective view which takes out only the structural member relevant to the reflective mirror mechanism and mirror bound suppression mechanism in the single-lens reflex camera of FIG. The principal part expansion perspective view which takes out and shows only the reflective mirror mechanism in the single-lens reflex camera of FIG. It is a figure explaining the effect | action of the mirror drive device in the single-lens reflex camera of FIG. 1, Comprising: The figure which shows the state just before mirror up operation | movement by a mirror drive device is performed. FIG. 10 is a diagram for explaining the operation of the mirror driving device in the single-lens reflex camera of FIG. 1, showing the state immediately after the reflection mirror mechanism completes the mirror up operation after the state of FIG. 9; It is a figure explaining the effect | action of the mirror drive device in the single-lens reflex camera of FIG. 1, Comprising: It is the state which the mirror up operation | movement of the reflective mirror mechanism was completed after the state of FIG. The figure which shows a state. FIG. 12 is a diagram for explaining the operation of the mirror driving device in the single-lens reflex camera of FIG. 1, after the state of FIG. 11, the state immediately after releasing the locking of the mirror hook lever during the mirror down operation; The figure which shows the state just before the latching state of the SMB lever of a mirror bound suppression mechanism is cancelled | released by the start of the mirror down operation | movement of a mechanism. FIG. 13 is a diagram for explaining the operation of the mirror driving device in the single-lens reflex camera of FIG. 1, and after the state of FIG. 12, the SMB lever is unlocked and immediately after completion of the mirror down operation, and the shutter charge operation is performed. The figure which shows the state immediately before starting. It is a figure explaining the effect | action of the structural member relevant to a mirror bound suppression mechanism among the mirror drive devices in the single-lens reflex camera of FIG. 1, Comprising: The state just before a SMB lever is shown, showing the same state as FIG. FIG. It is a figure explaining the effect | action of the structural member relevant to a mirror bound suppression mechanism among the mirror drive devices in the single-lens reflex camera of FIG. 1, Comprising: The same state as FIG. 10 is shown, and after the state of FIG. The figure which shows the state immediately after latching. It is a figure explaining the effect | action of the structural member relevant to a mirror bound prevention mechanism among the mirror drive devices in the single-lens reflex camera of FIG. 1, Comprising: The state which the latching of the SMB lever released after the state of FIG. Figure. It is a figure explaining the effect | action of the structural member relevant to a mirror bound suppression mechanism among the mirror drive devices in the single-lens reflex camera of FIG. 1, Comprising: The state same as FIG. 13 is shown, and after the state of FIG. The figure which shows the state which act | operated and the SMB lever and the cam contact | abutted. It is a figure explaining the effect | action of the structural member relevant to a mirror bound suppression mechanism among the mirror drive devices in the single-lens reflex camera of FIG. 1, Comprising: The figure which shows the state which the cam act | operated further after the state of FIG. It is a figure explaining the effect | action of the structural member relevant to a mirror bound suppression mechanism among the mirror drive devices in the single-lens reflex camera of FIG. 1, Comprising: The figure which shows the state after a cam act | operates after the state of FIG. . When the reflecting mirror mechanism in the single-lens reflex camera according to the embodiment of the present invention is viewed from the inside of the mirror box to the mirror driving device side, the engaging pin of the SMB lever is engaged with the engaged portion of the sub mirror lever. The top view which shows a state. The plane which shows the non-engagement state of the to-be-engaged part of a submirror lever, and the engagement pin of a SMB lever when the reflective mirror mechanism in the single-lens reflex camera of one Embodiment of this invention is seen from the left side surface side of a mirror box. Figure. The diagram which compares and shows the situation of the mirror bounce which arises when the main mirror transfers to a mirror down state from the mirror up state in the camera of one Embodiment of this invention, and the conventional camera. The diagram which compares and shows the condition of the mirror bounce which arises when the submirror transfers to the mirror down state from the mirror up state in the camera of one Embodiment of this invention, and the conventional camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Camera 2 ... Reflection mirror mechanism 3 ... Imaging unit 4 ... Finder unit 5 ... Distance measuring unit 6 ... Display unit 7 ... Strobe unit 8A ... Front cover 8B ... Rear cover 9 ... Upper cover 10 ... Mirror drive device 11 ... Body mount 12 ... Mirror boxes 12b, 12c, 12d ... Support shaft 12e ... Fixed part (groove)
12f …… Fixing part 13 …… Main mirror (main reflection mirror)
13b …… Mirror drive rod 13x …… Main mirror holding frame 14 …… Sub mirror (sub reflective mirror)
14b ... Rotating shaft 14x ... Sub-mirror holding frame 15 ... Shutter device 16 ... Image sensor 20 ... Drive motor 20aa ... Output gear 31 ... Charge gear 31a ... Cam 31aa ... Step 31b ... Hook Release boss 32 …… Drive lever 32a …… Cam follower 32b …… Locking portion 32c …… Rotation base portion 33 …… Mirror up spring 34 …… Mirror down spring 35 …… Mirror up / down lever 35c …… Pressing portion 36… ... mirror hook lever 37 ... hook lever locking spring 38 ... shutter charge lever 50 ... mirror bound prevention mechanism 51 ... SMB cam (sub mirror bound restraint cam)
51a …… Cam part (cam peripheral surface)
51aa …… Step part 52 …… SMB lever (sub-mirror bound prevention lever)
52a ...... Rotating base (hole)
52b …… Cam follower 52c …… engagement pin 52d …… locked portion 53 …… SMB spring (sub-mirror bound suppression spring)
54 …… SMB lever shaft (sub mirror bounce suppression lever support shaft)
55 …… Lever locking member 55a …… Rotation base (hole)
55b ...... Locking portion 55d …… Pressed portion 56 …… Lever locking member support shaft 57 …… Lever locking spring 61 …… Side plate 62 …… Sub mirror lever 62a …… Engaged portion

Claims (3)

In a single-lens reflex camera,
A fixing member;
A main reflection mirror that is pivotally supported by the fixing member and is movable between an observation position and a retracted position;
A first state in which the main reflection mirror is provided so as to be relatively rotatable, and the main reflection mirror is opened at a predetermined angle with respect to the main reflection mirror when the main reflection mirror is in the observation position; An engaged portion is provided that is capable of relative rotation between the second state that overlaps the main reflection mirror when in the retracted position and that is provided to suppress bounce in the first state. A sub-reflection mirror,
An engaging member that is provided on the fixing member and engages with the engaged portion in conjunction with the sub-reflection mirror shifting from the second state to the first state;
Comprising a single-lens reflex camera.   The engaged portion has a slope portion that engages with the engagement member, and engages with the slope portion of the engaged portion when the engaged portion and the engagement member are engaged. The single-lens reflex camera according to claim 1, wherein the main reflection mirror is held at the observation position, and the sub-reflection mirror is held in the first state. The engaged portion has a cam plate shape,
The single-lens reflex camera according to claim 1, wherein the engaging member is formed by a swing lever.

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