JP6840489B2 - Optical device - Google Patents

Description

The present invention relates to an optical device that holds an optical member such as a lens, and more particularly to an optical device that is applied to an imaging device capable of capturing a still image or a moving image.

In an image pickup device that converts a subject image into an electric signal and captures an image, the image sensor receives a shooting light flux, converts the photoelectric conversion signal output from the image sensor into image data, and records the image on a recording medium such as a memory card. To do.

As the image sensor, a CCD (Charge Coupled Device), a CMOS sensor (Complementary Metal Oxide Semiconductor), or the like is used.

Such an imaging device is provided with, for example, a finder device for the photographer to observe the subject image, a focus detection device for focusing on the subject image, and the like.

A finder device or a focus detection device is an optical unit composed of one or more optical components, and these optical components need to be mounted with high accuracy and firmly.

Conventionally, as an example of a method for holding an optical component, there is a method as disclosed below.

Patent Document 1 proposes a method of pressing and holding an optical component in a direction perpendicular to the optical axis and a direction perpendicular to the optical axis with a member having a spring property in a finder device having a configuration in which the optical component is held without being adhered. There is.

Further, as in Patent Document 2, a method of easily performing high-precision positioning of the optical component by abutting the protrusion provided on the optical component on the precision surface provided in the slit portion of the optical component holding member. Proposed.

Japanese Unexamined Patent Publication No. 2015-102821 Special Registration No. 3969397

However, in the prior art disclosed in Patent Document 1, there are many members that press and hold the optical component in the assembled state.

Therefore, when an optical component having high parallel / eccentric sensitivity is used, the surface accuracy of the optical component may be extremely distorted, and the desired optical performance may not be satisfied.

Further, in the prior art disclosed in Patent Document 2 described above, there is no mention of preventing the optical components from falling off when an impact is applied to the image pickup device, and when a cover member for preventing the falling off is provided, imaging is performed. The device becomes large.

Therefore, an object of the present invention is to minimize the distortion of the surface accuracy of the optical component with a simple configuration in holding the optical component. It is an object of the present invention to provide an optical device capable of preventing the optical components from falling off when an impact is applied to the image pickup device while maintaining it.

Therefore, the optical device of the present invention includes a holding member for holding the optical member and a holding member.
A first urging member formed on the holding member and urging the optical member in the optical axis direction and in a direction perpendicular to the optical axis direction.
A second urging member formed on the holding member and formed at a position different from that of the first urging member in the circumferential direction.
An optical device having a third urging member formed on the holding member and formed at a position closer to the second urging member than the first urging member in the circumferential direction.
When the optical device is not impacted, the second urging member contacts the optical member and urges the optical member in the optical axis direction and in the direction perpendicular to the optical axis.
The third urging member is not in contact with the optical member when the optical device is not impacted.
The third urging member is characterized in that when the optical device receives an impact, it comes into contact with the optical member and urges the optical member in the optical axis direction.

According to the present invention, in holding an optical component, an optical device capable of preventing the optical component from falling off when an impact is applied to the imaging device while minimizing the distortion of the surface accuracy of the optical component with a simple configuration. Can be provided.

Schematic diagram showing the overall configuration of the camera according to the embodiment of the present invention. Perspective view of the eyepiece unit 18 in the first embodiment Front view and rear view of the optical component 200 in the first embodiment Front view of the optical component holding member 300 in the first embodiment Perspective view of step 1 in the middle of assembly in the first embodiment Front view and side view of the eyepiece unit 18 in the first embodiment AA cross-sectional view of step 1 in the middle of assembly in the first embodiment Perspective view of step 2 in the middle of assembly in the first embodiment AA cross-sectional view of step 2 in the middle of assembly in the first embodiment Side view and cross-sectional view of step 2 in the middle of assembly in the first embodiment Side view of step 3 in the middle of assembly in the first embodiment Side view and cross-sectional view of the assembled state in the first embodiment Cross-sectional view taken along the line AA in the assembled state in the first embodiment Cross-sectional view taken along the line BB in the assembled state in the first embodiment Cross-sectional view taken along the line CC in the assembled state in the first embodiment Detailed side view of the eyepiece unit 18 in the first embodiment A perspective view and a top view of the focus detection device 14 in the second embodiment. Perspective view of the eyepiece unit 18 in the third embodiment Front view and rear view of the optical component 200 in the third embodiment Front view of the optical component holding member 300 in the third embodiment Front view of the eyepiece unit 18 in the third embodiment Front enlarged view of the eyepiece unit 18 in the third embodiment MM cross-sectional view of the eyepiece unit 18 in the third embodiment Detailed sectional view of MM of the eyepiece unit 18 in the third embodiment Perspective view of the eyepiece unit 18 in the fourth embodiment Front view of the eyepiece unit 18 in the fourth embodiment Perspective view of the eyepiece unit 18 in the fourth embodiment Front view of the eyepiece unit 18 in the fourth embodiment

[Example 1]
As a first embodiment of the present invention, the configuration of a camera as an optical device will be described with reference to the drawings.

The camera as an optical device in this embodiment is applied to a digital single-lens reflex camera using a solid-state image sensor such as a CCD or CMOS type.

FIG. 1 is a schematic view showing the overall configuration of the inside of the camera 100 in the embodiment of the present invention.

In FIG. 1, 10 is a photographing lens, 11 is a movable main mirror, 12 is a sub mirror, and 13 is a focusing screen.

Further, 14 is a focus detection device, 15 is an image sensor, 16 is a mirror box, 17 is a pentaprism, 18 is an eyepiece unit, 19 is a photometric device, and 20 is a shutter.

The photographing lens 10 is configured to be removable from the camera 100 main body. Note that 14 and 18 correspond to the optical component holding device according to the claim.

The subject image is formed on the image plane by the photographing lens 10.

The photographing lens 10 is composed of a lens driving device (not shown), a diaphragm blade group for performing exposure control, a diaphragm driving device for driving the diaphragm blade group, and the like.

The main mirror 11 is composed of a half mirror, and when the mirror is in the down state, the subject image formed by the photographing lens 10 is reflected toward the focusing screen 13.

At this time, the main mirror 11 transmits a part of the subject image toward the sub mirror 12. The sub mirror 12 reflects the subject image transmitted through the main mirror 11 toward the focus detection device 14.

The main mirror 11 is driven by a mirror drive mechanism (not shown).

Then, there is a transition between a mirror-down state in which the subject image is located in the imaging optical path and guides the subject image to the focusing screen 13, and a mirror-up state in which the subject image is retracted from the imaging optical path and guided to the image sensor 15.

The sub mirror 12 is displaced in conjunction with the movable main mirror 11 being driven by the mirror drive mechanism.

Specifically, when the main mirror 11 is in the mirror down state, the sub mirror 12 guides the subject image transmitted through the main mirror 11 to the focus detection device 14.

On the other hand, when the main mirror 11 is in the mirror lockup state, the sub mirror 12 retracts from the imaging optical path together with the main mirror 11.

The mirror box 16 is a substantially cubic member formed by resin molding or the like, which is configured to be able to fix a mirror drive mechanism and a mirror angle adjusting plate (not shown).

The pentaprism 17 converts the subject image formed on the focusing screen 13 into an upright image and reflects it.

The eyepiece unit 18 is composed of an optical component 200 and an optical component holding member 300, which will be described later, and the pentaprism 17 converts the object image into an erect image and brings the reflected subject image to the photographer's eyes.

Further, the eyepiece unit 18 has a function of adjusting the diopter according to the photographer.

The photometric device 19 measures the brightness of the subject image imaged on the focusing screen 13 via the pentaprism 17, and drives the shutter 20 and the above-mentioned aperture drive device based on the calculated output signal to expose the subject during exposure. Take control.

The focus detection device 14 is composed of an optical component 400 and an optical component holding member 500, which will be described later, and detects the amount of defocus of the subject image.

The lens driving device (not shown) of the photographing lens 10 is controlled based on the output signal of the focus detection device 14, and the focus is adjusted.

The shutter 20 mechanically controls the incident of the subject image on the image plane.

The image sensor 15 takes an image of the subject imaged by the photographing lens 10 and converts it into an electric signal. A solid-state image sensor such as a CCD type or a CMOS type is used for the image sensor 15.

From here, the optical component holding device provided in the single-lens reflex camera according to the first embodiment of the present invention will be described with reference to FIGS. 2 to 4.
FIG. 2A is a perspective view of the eyepiece unit 18 in the first embodiment as viewed from the −x direction.
FIG. 2B is a perspective view of the eyepiece unit 18 in the first embodiment as viewed from the + x direction.
FIG. 3A is a front view of the optical component 200 in the first embodiment.
FIG. 3B is a rear view of the optical component 200 in the first embodiment.
FIG. 4 is a front view of the optical component holding member 300 in the first embodiment.

FIG. 2 shows a state in which the optical component 200 included in the eyepiece unit 18 shown in the overall configuration inside the camera 100 described above is assembled to the optical component holding member 300 in the first embodiment of the present invention.

Hereinafter, the optical component 200 in the text has the same meaning as the optical member.

The eyepiece unit 18 is composed of a plurality of optical components, and the first embodiment of the present invention particularly relates to a diopter adjusting lens slidable in the z-axis direction.

By moving the diopter adjustment lens in the z-axis direction, it is possible to adjust the diopter of the eyepiece unit 18.

Generally, the optical component 200 is manufactured by molding an optical resin (ZEONEX, polycarbonate, etc.) having high transparency.

The optical component 200 has a substantially square shape, and a lens effective surface having a substantially spherical shape and an R1 surface shown in the figure are formed in the center.

Further, the optical component holding member 300 is manufactured by molding a resin (polycarbonate or the like). The optical component holding member 300 has a substantially box shape and can accommodate the optical component 200.

The optical component 200 and the optical component holding member 300 are formed with a structure for contacting (engaging) with each other, and the details will be described later.

The optical component 200 includes a pair of first protrusions 201a and 201b extending outward in a direction perpendicular to the optical axis (direction x in the drawing) and a pair of second protrusions on the side surfaces facing the protrusions. It has protrusions 202a and 202b of the above.

The optical component holding member 300 comes into contact with the first protrusions 201a and 201b of the optical component 200, and attaches the optical component 200 in the optical axis direction (drawing z direction) and in the direction perpendicular to the optical axis (drawing x direction). It has a pair of first urging members 301a and 301b to be urged.

Further, the optical component holding member 300 comes into contact with the second protrusions 202a and 202b of the optical component 200, and a pair of second attachments that urge the optical component 200 in the direction perpendicular to the optical axis and in the direction perpendicular to the optical axis. It has force members 302a and 302b.

Further, the optical component holding member 300 is not in contact (engaged) with the second protrusions 202a and 202b of the optical component 200.

Further, the optical component holding member 300 has a pair of third urging members 303a, 303b that overlap with the second protrusions 202a, 202b of the optical component 200 in the plane direction perpendicular to the optical axis. There is.

The second urging member 302 is formed in a phase different from that of the first urging member 301 in the circumferential direction.

The third urging member 303 is formed in a phase closer to the second urging member 302 than the first urging member 301 in the circumferential direction.

When viewed from a direction perpendicular to the optical axis, a pair of second urging members 302 are provided symmetrically with respect to the optical axis.

When viewed from a direction perpendicular to the optical axis, a pair of third urging members 303 are provided symmetrically with respect to the optical axis.

When viewed from a direction perpendicular to the optical axis, the claws at the tips of the protrusions extending in the optical axis direction of the pair of third urging members 303a and 303b face outward with respect to the center of the optical axis. ..

When viewed from a direction perpendicular to the optical axis, the claws at the tips of the protrusions extending in the optical axis direction of the pair of second urging members 302a and 302b face inward with respect to the center of the optical axis. ..

Further, in the case of the configuration for holding the diopter adjusting lens as in the first embodiment of the present invention, the optical component holding member 300 has a sliding hole 308 or a sliding shaft (not shown).

Hereinafter, the optical component 200 and the optical component holding member 300 will be described in detail.

FIG. 3 is a front view and a rear view of the optical component 200 according to the first embodiment of the present invention, and FIG. 4 is a front view of the optical component holding member 300.

As shown in FIG. 3A, the pair of first protrusions 201a and 201b and the pair of second protrusions 202a and 202b of the optical component 200 pass through the center of the optical axis of the optical component 200 shown in FIG. 3, respectively. It is provided substantially symmetrically with respect to the x-axis.

With such a configuration, since the optical component 200 comes into contact with the optical component holding member 300 at a position balanced from the center of the optical axis, distortion of surface accuracy on the effective surface of the lens can be suppressed.

203a, 203b, 203c in FIG. 3B are contact surfaces with the optical component holding member 300 in the optical component 200, and 307a, 307b, 307c in FIG. 4 are contact surfaces with the optical component 200 in the optical component holding member 300. It is the contact surface of.

In the optical component 200, the contact surface 203a is formed at the base of the first protrusion 201a, the contact surface 203b is formed at the base of the first protrusion 201b, and the contact surface 203c is formed between the second protrusions 202a and 202b. Has been done.

The contact surface 203a of the optical component 200 is in contact with the contact surface 307a of the optical component holding member 300.

The contact surface 203b of the optical component 200 is in contact with the contact surface 307b of the optical component holding member 300. The contact surface 203c of the optical component 200 is in contact with the contact surface 307c of the optical component holding member 300.

As described above, the contact surfaces 203a, 203b, and 203c are arranged in a well-balanced manner with respect to the center of the optical axis of the lens effective surface of the optical component 200. Specifically, in this embodiment, the arrangement is a substantially isosceles triangle.

As a result, distortion of the surface accuracy of the optical component 200 in the completed assembly state can be suppressed. Hereinafter, the contact surface between the optical component 200 and the optical component holding member 300 is referred to as a reference surface 250.

Next, a detailed procedure for attaching the optical component 200 to the optical component holding member 300 will be described with reference to FIGS. 5 to 12.

FIG. 5A is a perspective view of the assembling step 1 as viewed from the −x direction.
FIG. 5B is a perspective view of step 1 in the middle of assembly as viewed from the + x direction.
FIG. 6 is a front view and a side view of the eyepiece unit 18 in the first embodiment.
FIG. 7 is a cross-sectional view of the alternate long and short dash line portion AA of FIG. 6 in the assembling step 1.
FIG. 8 is a perspective view of the assembling step 2 as viewed from the −x direction.
FIG. 9 is a cross-sectional view of the alternate long and short dash line portion AA of FIG. 6 in the assembly intermediate stage 2.
FIG. 10 is a side view of the assembling step 2.
FIG. 11 is a side view of the assembling step 3.
FIG. 12A is a side view of the assembled state.
FIG. 12B is a cross-sectional view of the alternate long and short dash line portion BB of FIG. 6 in the assembled state.
FIG. 12 (c) is a cross-sectional view of the alternate long and short dash line portion CC of FIG. 6 in the assembled state.

First, as shown in FIG. 5, the optical component 200 is inserted into the optical component holding member 300 from an oblique direction (stage 1 in the middle of assembly).

FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6 in the assembling step 1. The protrusion 201a of the optical component 200 is inserted into the −z side of the first urging member 301a of the optical component holding member 300, and as shown in FIG. 5, the protrusion 202a of the optical component 200 and the optical component holding The second urging member 302a of the member 300 is not yet in contact.

When the optical component 200 is rotated (around the Y axis) around the protrusion 301a in the direction of the arrow R in FIG. 5 from the above state, the state shown in FIG. 8 is obtained (stage 2 in the middle of assembly).

FIG. 9 is a cross-sectional view taken along the line AA of FIG. 6 in the assembling step 2.

At this time, as shown in the enlarged view E of FIG. 9, the protrusion 201a of the optical component 200 moves in the + z direction, and pushes up the first urging member 301a of the optical component holding member 300 in the + z direction.

As a result, as shown in the direction of arrow F in the enlarged view E of FIG. 9, a load that presses the protrusion 201a of the optical component 200 in the −z direction acts.

On the other hand, FIG. 10 is a side view in the assembly intermediate stage 2.

At this time, as shown in FIG. 10, the protrusion 202a of the optical component 200, the second urging member 302a of the optical component holding member, and the third urging member 303a are not yet in contact with each other.

From here, the optical component 200 is inserted from a direction substantially parallel to the optical component holding member 300 in the z direction.

FIG. 11 (stage 3 in the middle of assembly) shows a state in which the optical component 200 is further pushed in the −z direction from the state shown in FIG.

Here, the second protrusion 202a of the optical component 200, the second urging member 302a of the optical component holding member 300, and the third urging member 303a begin to come into contact (engagement).

Next, a force that spreads in the y direction acts on the second urging member 302a and the third urging member 303a of the optical component holding member 300.

Due to the action of this force, the second urging member 302a and the third urging member 303a are elastically deformed and expanded in the y direction.

Here, the tips of the second urging member 302a and the third urging member 303a have an inclined shape. As a result, the assemblability is also improved.

Further, the optical component 200 is pushed in.

Then, the tips of the second urging member 302a and the third urging member 303a of the optical component holding member 300 get over the tip of the second protrusion 202a of the optical component 200, and the state shown in FIG. 12A is shown. (Completed assembly).

In this state, a load that pulls the optical component 200 in the −z direction acts as shown by the arrow Fz2 in FIG. 12B around the second urging member 302a.

On the other hand, around the third urging member 303b, as shown in FIG. 12C, a clearance Δz is formed between the optical component 200 and the third urging member 303b, so that the optical component has a clearance Δz. No load acts on 200.

Further, the positioning of the optical component 200 and the optical component holding member 300 in the x-direction and the y-direction is in a fitting relationship with a minute gap due to a positioning portion (not shown).

Finally, the contact is completed when the reference surface 250 of the above-mentioned optical component 200 and the optical component holding member 300 comes into contact with each other.

As in this embodiment, the first urging members 301a and 301b and the second urging members 302a and 302b are configured to bring the optical component 200 into contact with each other. By doing so, the optical component 200 can be easily held with respect to the optical component holding member 300 without using an adhesive or additional components.

Subsequently, with reference to FIGS. 13 to 16, the roles of the contact portions of the optical component holding member 300 and the optical component 200 will be described in detail.

FIG. 13 is a detailed cross-sectional view of the alternate long and short dash line portion AA of FIG. 6 in the assembled state.
FIG. 14 is a detailed cross-sectional view of the alternate long and short dash line portion BB of FIG. 6 in the assembled state.
FIG. 15 is a detailed cross-sectional view of the alternate long and short dash line portion CC of FIG. 6 in the assembled state.
FIG. 16 is a detailed side view of the eyepiece unit 18 in the first embodiment.

FIG. 13 is a sectional view taken along the line AA and an enlarged view F of the first protrusion 201a (201b) of the optical component 200 and the first urging member 301a (301b) of the optical component holding member 300 in the assembled state. is there.

When the slope portion 220a (220b) of the first protrusion 201a (201b) and the edge 320a (320b) of the first urging member 301a (301b) of the optical component holding member 300 come into contact with each other, the optical component 200 can be formed. Being urged.

The urging force in this case is divided into an urging force Fz1 in the optical axis direction and an urging force Fx1 in the direction perpendicular to the optical axis.

FIG. 14 is a cross-sectional view taken along the line BB and an enlarged view G of the second protrusion 202a (202b) of the optical component 200 and the second urging member 302a (302b) of the optical component holding member 300 in the assembled state. is there.

When the slope portion 230a (230b) of the second protrusion 202a (202b) and the edge 330a (330b) of the second urging member 302a (302b) of the optical component holding member 300 come into contact with each other, the optical component 200 can be formed. Being urged.

The urging force in this case is divided into an urging force Fz2 in the optical axis direction and an urging force Fx2 in the direction perpendicular to the optical axis.

The contact between the slope portion 220a (220b) and the edge 320a (320b) of the optical component 200 and the optical component holding member 300, and the contact between the slope portion 230a (230b) and the edge 330a (330b) are in line contact.

By making line contact, the urging forces Fz1, Fx1, and Fz2, Fx2 are minimized, and the distortion of surface accuracy is suppressed.

If the surface accuracy distortion of the optical component 200 can be tolerated, the line contact between the optical component 200 and the optical component holding member 300 may be surface contact.

Further, the urging force Fz1 in the optical axis direction of the first urging member 301a (301b) with respect to the optical component 200 is larger than the urging force Fz2 in the optical axis direction of the second urging member 302a (302b) with respect to the optical component 200. large.

As described above, the reference surface 250 of the optical component 200 and the optical component holding member 300 is formed on the roots of the protrusions of the first urging member 301a (301b) and the third urging member 303a (303b). It is located between the protrusions.

Therefore, the optical component 200 and the reference surface 250 of the optical component holding member 300 are provided at the base of the first urging member 301a (301b) having a larger urging force in the optical axis direction to hold the optical component 200 in a well-balanced manner. doing.

Further, the balance of the urging force on the optical component 200 is considered.

In that case, from the reference surface 250 of the optical component 200 and the optical component holding member 300 to the edge 320a (320b) which is the contact portion between the first urging member 301a (301b) shown in FIG. 13 and the optical component 200. Let the height be z1.

Let z2 be the height to the edge 330a (330b), which is the contact portion between the second urging member 302a (302b) shown in FIG. 14 and the optical component 200.

It is preferable that z1 and z2 are equal.

FIG. 15 is a CC sectional view and an enlarged view H of a second protrusion 202a (202b) of the optical component 200 and a third urging member 303a (303b) of the optical component holding member 300 in the assembled state. is there.

As shown in FIG. 15, a clearance Δz is provided between the second protrusion 202a (202b) of the optical component 200 and the third urging member 303a (303b) of the optical component holding member 300 in the assembled state. Has been done.

Further, as shown in the front view of FIG. 6, the second protrusions 202a and 202b of the optical component 200 and the third urging member 303a (303b) of the optical component holding member 300 are in the plane direction perpendicular to the optical axis. It is superimposed on.

At this time, the third urging member 303a (303b) of the optical component holding member 300 is provided with a clearance Δz in the assembled state, so that the urging force is not generated on the optical component 200.

On the other hand, when an impact is applied to the camera 100 including the optical component 200 and the optical component holding member 300 in the + z direction of FIG. 6, that is, the falling direction of the optical component 200, the optical component 200 moves in the + z direction.

At that time, the clearance Δz between the second protrusion 202a (202b) of the optical component 200 shown in FIG. 15 and the third urging member 303a (303b) of the optical component holding member 300 becomes 0 and surface contact is made. Therefore, the third urging member 303a (303b) is urged in a direction to prevent the optical component 200 from falling off.

When the camera 100 receives an impact, the third urging member 303a (303b) is in surface contact with the optical component 200, while the second urging member 302a (302b) is in line contact with the optical component 200. ing.

Therefore, the contact area of the third urging member 303a (303b) with the optical component 200 is larger than that of the second urging member 302a (302b), and the effect of preventing the optical component 200 from falling off is high.

By adopting the above configuration, there is a clearance Δz in the state where the third urging member is assembled.

Therefore, the third urging member 303a (303b) does not affect the surface accuracy of the optical component 200, while the clearance Δz becomes 0 when an impact is applied to the camera 100, and the urging member 303a (303b) is urged in the direction of preventing the optical component 200 from falling off. To do.

Therefore, it is possible to prevent the optical component 200 from falling off when an impact is applied to the camera 100 while minimizing the distortion of the surface accuracy of the optical component 200.

FIG. 16 is a side view and an enlarged view I of the eyepiece unit 18 in the first embodiment.

The positional relationship between the second protrusions 202a and 202b of the optical component 200 and the second urging members 302a and 302b and the third urging members 303a and 303b of the optical component holding member 300 will be described with reference to FIG. To do.

The second urging members 302a and 302b of the optical component holding member 300 and the third urging members 303a and 303b are provided substantially symmetrically with respect to the second protrusions 202a and 202b of the optical component 200, respectively. ..

Specifically, in this embodiment, the second urging member 302a and the third urging member 303a of the optical component holding member 300 are provided substantially symmetrically with respect to the second protrusion 202a of the optical component 200. There is.

Hereinafter, it is referred to as a first urging member group 304a.

Further, the second urging member 302b and the third urging member 303b of the optical component holding member 300 are provided substantially symmetrically with respect to the second protrusion 202b of the optical component 200.

Hereinafter, it is referred to as a second urging member group 304b.

Further, the second urging members 302a and 302b of the optical component holding member 300 have protrusions 305a and 305b, respectively.

Similarly, the third urging members 303a and 303b of the optical component holding member 300 have protrusions 306a and 306b, respectively.

In the first urging member group 304a and the second urging member group 304b, the protrusions 305a and 305b and the protrusions 306a and 306b extend in opposite directions.

Therefore, even when the optical component 200 is displaced in the fitting backlash in the y direction of FIG. 16, the urging function of the second urging members 302a and 302b and the dropout prevention function of the third urging members 303a and 303b Can be guaranteed.

Specifically, in the enlarged view I of FIG. 16, y ₁ shows the engagement amount between the second protrusion 202a of the optical component 200 and the second urging member 302a of the optical component holding member.

y ₂ indicates the amount of engagement between the second protrusion 202a of the optical component 200 and the third urging member 303a of the optical component holding member 300.

Similarly, _{y 4} shows the engagement of the second urging member 302b of the second protrusion 202b and the optical component holding member 300 of the optical component 200.

y ₃ shows a third dependency of the biasing member 303b of the second protrusion 202b and the optical component holding member 300 of the optical component 200.

Here, when the optical component 200 is displaced in the drawings the + y direction, relates the amount _{y 3,} and the third relates amount _{y 2} biasing member 303a of the projecting portion 302b of the second urging member is thereby reduced.

On the other hand, relates the amount _{y 1,} and the third relates amount _{y 4} of the urging member 303b of the projecting portion 302a of the second urging member is increased.

Therefore, it is assumed that the optical component 200 is displaced in either the drawing + y direction or the −y direction. Nevertheless, one of the second urging members 302a and 302b of the optical component holding member 300 and one of the third urging members 303a and 303b are guaranteed to urge the optical component 200 without fail.

Further, in the first urging member group 304a and the second urging member group 304b, the second urging members 302a and 302b are arranged at positions far from the center of the optical axis of the optical component 200.

Further, the third urging members 303a and 303b are arranged at positions close to the center of the optical axis.

By adopting such a configuration, the balance between the urging force of the first urging members 301a and 301b of the optical component holding member 300 and the urging force of the second urging members 302a and 302b is improved, and the assembly is completed. Distortion of the surface accuracy of the optical component 200 in the state can be suppressed.

Further, the protrusions 306a and 306b of the third urging member described above have an angle θ from the reference surface 250 side (−z direction) to the anti-reference surface side (+ z direction) in the optical axis direction of the optical component 200. _It has inclined portions 308a and 308b of 1.

The second protrusions 202a and 202b of the optical component 200 have inclined portions 204a and 204b corresponding to the inclined portions 308a and 308b.

With such a configuration, when the inclined portions 204a and 204b of the optical component 200 come into surface contact with the inclined portions 308a and 308b of the optical component holding member 300, the opening of the third urging members 303a and 303b is suppressed. The force works in the direction of doing.

Therefore, the effect of preventing the optical component 200 from falling off when an impact is applied to the camera 100 can be further enhanced.

Further, in this embodiment, the magnitude relation of the urging forces Fx1 and Fx2 in the direction perpendicular to the optical axis in FIGS. 13 and 14 is configured such that Fx1> Fx2.

At this time, the optical component 200 is always in the −x direction, that is, the contact between the second protrusions 202a and 202b of the optical component 200 and the second urging members 302a and 302b of the optical component holding member 300, and the third urging. The members 303a and 303b are urged in a direction in which the overlap is deepened.

By adopting such a configuration, the contact of the second urging members 302a and 302b and the superposition of the third urging members 303a and 303b are guaranteed to a certain level or more with respect to the second protrusions 202a and 202b. To.

Therefore, the effect of preventing the optical component 200 from falling off can be further enhanced.

Further, the second protrusions 202a and 202b of the optical component 200 have inclined portions 205a and 205b on the reference surface 250 side.

Specifically, in this embodiment, the inclined portions 205a and 205b are formed in an R shape.

Further, the protrusions 305a and 305b and the protrusions 306a and 306b of the optical component holding member 300 have inclined portions 309a and 309b at their tips.

With such a configuration, the inclined portions 205a and 205b come into contact with the inclined portions 309a and 309b at the time of assembly. Therefore, the plastic deformation of the second urging member protrusions 305a and 305b and the third urging member 303a and 303b can be suppressed.

Further, since the reaction force at the time of assembly is dispersed by the inclined portions 205a and 205b and the inclined portions 309a and 309b, the assembling property is also improved.

Further, in this embodiment, as shown in FIG. 6, the optical component holding member 300 has a sliding hole 310 in the −x direction with respect to the center of the optical axis of the optical component 200.

The optical component holding member 300 is slidable in the z-axis direction along the sliding hole 310, and the eyepiece unit 18 is diopter adjusted.

Generally, the vicinity of the sliding hole 310 is the driving side, and the opposite side across the optical component 200 is the driven side. By engaging with a member (not shown) on the driving side, the optical component holding member 300 is in the z direction. Slide to.

Therefore, an impact is applied to the camera 100 in the direction (+ z direction) in which the optical component 200 falls off from the optical component holding member 300. At that time, the optical component holding member 300 receives an impact through a member configured in the vicinity of the sliding shaft 310 (not shown).

In this embodiment, the third urging members 303a and 303b are arranged substantially in the vicinity of the sliding hole 310.

In this embodiment, the second urging member contacts the optical component 200 and urges the optical component 200 in the optical axis direction and in the direction perpendicular to the optical axis when the optical device is not impacted. Further, the third urging member 303 is not in contact with the optical component 200 when the optical device is not impacted. Further, when the optical device receives an impact, the third urging member contacts the optical component 200 and urges the optical component 200 in the optical axis direction.

With such a configuration, the optical component 200 and the third urging members 303a and 303b come into surface contact with each other in the vicinity of the sliding shaft 310 which is susceptible to impact, and the optical component 200 can be prevented from falling off. ..

Further, in the present embodiment, the area where the second urging member comes into contact with the optical member when the optical device is not impacted is the area where the third urging member is the optical member when the optical device is impacted. Smaller than the contact area.

[Example 2]
Subsequently, as a second embodiment of the present invention, an example in which the present invention is applied to the focus detection device 14 will be described with reference to FIG.

FIG. 17A is a perspective view of the focus detection device 14 in the second embodiment as viewed from the + x direction.
FIG. 17B is a top view of the focus detection device 14 in the second embodiment as viewed from the + y direction.

The function of the focus detection device 14 in the second embodiment of the present invention will be described.

In the camera 100, the light from the subject passes through the photographing lens 10 and then enters the main mirror 11 composed of the half mirror.

A part of the light incident on the main mirror 11 passes through the main mirror, is reflected by the sub mirror 12, and is incident on the optical component 400 of the focus detection device 14. Here, the optical component 400 is a field lens that collects incident light (luminous flux).

FIG. 17 shows a state in which the optical component 400 is assembled to the optical component holding member 500 in the second embodiment of the present invention.

Similar to the eyepiece unit 18 of the first embodiment described above, the optical component 400 has first protrusions 401a and 401b, and second protrusions 402a and 402b.

Therefore, the optical component holding member 500 has first urging members 501a and 501b, second urging members 502a and 502b, and third urging members 503a and 503b.

The first protrusions 401a and 401b have the same functions as the 201a and 201b in the first embodiment.

The second protrusions 402a and 402b have the same functions as the 202a and 202b in the first embodiment.

The first urging members 501a and 501b have the same functions as the 301a and 301b in the first embodiment.

The second urging members 502a and 502b have the same functions as the 302a and 302b in the first embodiment. The third urging members 503a and 503b have the same functions as the 303a and 303b in the first embodiment.

As described above, the present invention is applicable not only to the eyepiece unit 18, but also to other optical component holding devices including the focus detection device 14.

[Example 3]
Subsequently, a third embodiment of the present invention will be described with reference to FIGS. 18 to 24.

FIG. 18A is a perspective view of the eyepiece unit 18 in the third embodiment as viewed from the −x direction.
FIG. 18B is a perspective view of the eyepiece unit 18 in the third embodiment as viewed from the + x direction.
FIG. 19A is a front view of the optical component 200 in the third embodiment.
FIG. 19B is a rear view of the optical component 200 in the third embodiment.
FIG. 20 is a front view of the optical component holding member 300 in the third embodiment.
FIG. 21 is a front view of the eyepiece unit 18 in the third embodiment.
FIG. 22 is an enlarged view of FIG. 21.
FIG. 23 is a detailed cross-sectional view of the alternate long and short dash line portion KK of FIG.
FIG. 24 is a detailed cross-sectional view of the alternate long and short dash line portion KK of FIG. 22 in a state where an impact is applied in the falling direction of the optical component 200.

FIG. 18 shows a state in which the optical component 200 is assembled to the optical component holding member 300 in the third embodiment of the present invention.

The optical component 200 has a pair of first protrusions 201a and 201b extending outward in a direction perpendicular to the optical axis (direction z in the drawing) and side surfaces facing the first protrusions 201a and 201b. It has at least one second protrusion 202.

The optical component holding member 300 is a pair of first urging members that come into contact with the first protrusions 201a and 201b of the optical component 200 and urge the optical component 200 in the direction perpendicular to the optical axis and in the direction perpendicular to the optical axis. It has 301a and 301b.

Further, the optical component holding member 300 contacts the second protrusion 202 of the optical component 200 and biases the optical component 200 in the direction perpendicular to the optical axis and at least a pair of second biases. It has members 302a and 302b.

Further, the second urging members 302a and 302b have protrusions 311a and 311b extending in the direction of the optical component 200. The optical component 200 has concave shapes 205a and 205b that are not in contact with the protrusions 311a and 311b.

When the optical device is not impacted, the optical component 200 moves in a direction approaching the optical axis from the tip of the protrusion extending in the optical axis direction of the second urging member 302 at the base of the protrusion of the optical component 200. It has a groove that does not come into contact with the extended protrusion.

Further, when viewed from a direction perpendicular to the optical axis, the groove portion of the optical component 200 extends from the bottom surface toward the opening surface.

Hereinafter, the optical component 200 and the optical component holding member 300 will be described in detail.

FIG. 19 is a front view and a rear view of the optical component 200 according to the third embodiment of the present invention.

As shown in FIG. 19A, it is the same as the first embodiment of the present invention.

The closer the first protrusions 201a and 201b of the optical component 200 in contact with the optical component holding member 300 with respect to the center of the optical axis of the optical component 200 are, the more the distortion of surface accuracy is suppressed. Is suitable for.

203a, 203b, and 203c of FIG. 19B are contact surfaces of the optical component 200 with the optical component holding member 300.

Reference numerals 307a, 307b, and 307c in FIG. 20 are contact surfaces of the optical component holding member 300 with the optical component 200.

In the optical component 200, the contact surface 203a is formed at the root of the first protrusion 201a, the contact surface 203b is formed at the root of the first protrusion 201b, and the contact surface 203c is formed at the root of the second protrusion 202. There is.

The contact surface 203a of the optical component 200 is in contact with the contact surface 307a of the optical component holding member 300.

The contact surface 203b of the optical component 200 is in contact with the contact surface 307b of the optical component holding member 300.

The contact surface 203c of the optical component 200 is in contact with the contact surface 307c of the optical component holding member 300.

As described above, the contact surfaces 203a, 203b, and 203c are arranged in a well-balanced manner with respect to the center of the optical axis of the lens effective surface of the optical component 200.

Specifically, in this embodiment, the arrangement is a substantially isosceles triangle. As a result, distortion of the surface accuracy of the optical component 200 in the completed assembly state can be suppressed.

FIG. 21 is a front view of the optical component 200 and the optical component holding member 300 in a completed assembly state according to the third embodiment of the present invention.

In the third embodiment of the present invention, the contact between the first protrusions 201a and 201b of the optical component 200 and the first urging members 301a and 301b of the optical component holding member 300 is the same as in the first embodiment. , As shown in FIG.

Further, the contact between the second protrusion 202 of the optical component 200 and the second urging members 302a and 302b of the optical component holding member 300 is as shown in FIG. 14 as in the first embodiment.

FIG. 22 is an enlarged view J of the second protrusion 202 of the optical component 200 and the second urging members 302a and 302b of the optical component holding member 300 in FIG. 21.

As shown in FIG. 22, the protrusions 311a and 311b of the optical component holding member 300 extend in the direction of the optical component 200, and the optical component 200 has concave shapes 205a and 205b. Y in FIG. 22 represents the engagement amount between the second protrusion 202 of the optical component 200 and the second urging members 302a and 302b of the optical component holding member 300 in the assembled state.

FIG. 23 is a KK cross-sectional view of the optical component 200 and the optical component holding member 300 in FIG. 22.

As shown in FIG. 23, the concave shape 205a of the optical component 200, the 205b, the angle theta ₂ of the inclined 206a, 206b are formed.

In this embodiment, the angle θ ₂ is formed so as to have an inclination of 5 ° or more. This improves the moldability of the optical component 200.

Further, a clearance of Δy is provided between the concave shapes 205a and 205b of the optical component 200 and the protrusions 311a and 311b of the optical component holding member 300.

Therefore, in the assembled state, the concave shapes 205a and 205b of the optical component 200 and the protrusions 311a and 311b of the optical component holding member 300 are not in contact with each other.

On the other hand, FIG. 24 shows a state in which the optical component 200 is lifted and the second urging members 302a and 302b of the optical component holding member 300 are starting to open when an impact is applied to the camera 100.

When the second urging members 302a and 302b are opened by a certain amount or more, the clearance Δy = 0 between the concave shapes 205a and 205b of the optical component 200 and the protrusions 311a and 311b of the optical component holding member 300.

At this time, as shown in FIG. 24, the inclinations 206a and 206b formed in the concave shapes 205a and 205b of the optical component 200 come into contact with the protrusions 311a and 311b of the optical component holding member 300.

Then, the second urging members 302a and 302b of the optical component holding member 300 are urged in the Fy1 and Fy2 directions, that is, in the closing direction to prevent the optical component 200 from falling off.

With such a configuration, it is possible to prevent the optical component 200 from falling off when an impact is applied to the camera 100, while minimizing the distortion of the surface accuracy of the optical component 200 in the assembled state.

[Example 4]
Finally, a fourth embodiment of the present invention will be described with reference to FIGS. 25 to 28.

FIG. 25 is a perspective view of the optical component holding device 18 according to the first embodiment of the fourth embodiment as viewed from the + x direction. FIG. 26 is a front view of the optical component holding device 18 according to the first embodiment of the fourth embodiment.

FIG. 27 is a perspective view of the optical component holding device 18 according to the second embodiment of the fourth embodiment as viewed from the + x direction.

FIG. 28 is a front view of the optical component holding device 18 according to the second embodiment of the fourth embodiment.

In the first embodiment of the fourth embodiment of the present invention, first, the optical component 200 has the second protrusions 202a and 202b, and the optical component holding member 300 has the second urging members 302a and 302b and the third urging member. 303a and 303b are provided.

Further, the optical component 200 is provided with concave shapes 205a and 205b, and the second urging members 302a and 302b of the optical component holding member 300 are provided with protrusions 311a and 311b.

Here, when the optical component holding device 18 receives an impact, the protrusions 311a and 311b come into contact with the concave shapes 205a and 205b of the optical component 200, so that the second urging members 302a and 302b are the optical components 200. It is urged in the closing direction (direction to prevent falling off).

In this way, since the second urging members 302a and 302b are urged in the closing direction, the optical component 200 is urged by the second urging members 302a and 302b when the optical component holding device 18 is not impacted. The force urging in the z direction may be minimal.

Further, when the optical component holding device 18 receives an impact, the third urging members 303a and 303b come into surface contact with the second protrusions 202a and 202b of the optical component 200 and are urged in a direction to prevent them from falling off. To do.

In this way, by combining the dropout prevention effect, the optical component 200 is moved in the z direction by the second urging members 302a and 302b when the optical component holding device 18 is not impacted as compared with the second embodiment. The force that urges the optics can be further reduced.

That is, more effectively, it is possible to prevent the optical component 200 from falling off when an impact is applied to the camera 100 while minimizing the distortion of the surface accuracy of the optical component 200 in the assembled state.

Subsequently, the second embodiment of the fourth embodiment will be described.

In the second embodiment of the fourth embodiment, first, the optical component 200 has the second protrusions 202a and 202b, the contact surface 207, and the optical component holding member 300 has the second urging members 302a and 302b, and the third urging member. 303c is provided.

Further, the optical component 200 is provided with concave shapes 205a and 205b, and the second urging members 302a and 302b of the optical component holding member 300 are provided with protrusions 311a and 311b.

Similarly, in the second embodiment of the fourth embodiment, the second urging members 302a and 302b are urged in the closing direction.

Therefore, when the optical component holding device 18 is not impacted, the force for urging the optical component 200 in the z direction by the second urging members 302a and 302b may be minimized.

Further, when the optical component holding device 18 receives an impact, the third urging member 303c comes into surface contact with the contact surface 207 of the optical component 200 and is urged in a direction to prevent the optical component 200 from falling off.

In the second embodiment of the fourth embodiment, the number of the third urging member is smaller than that of the second embodiment, and the dropout prevention effect can be obtained with a simpler configuration.

As described above, according to the present invention, in holding the optical component, the optical component is prevented from falling off when an impact is applied to the image pickup apparatus while minimizing the distortion of the surface accuracy of the optical component with a simple configuration. It is possible to provide an optical component holding device capable of this.

Although preferable examples of the present invention have been described above, the present invention is not limited to these examples, and various modifications and changes can be made within the scope of the gist thereof.

14 Focus detection device 18 Eyepiece unit 200, 400 Optical parts 201a, 201b, 401a, 401b First protrusions 202a, 202b, 402a, 402b, 202 Second protrusions 207 Contact surface 300, 500 Optical parts holding member 301a, 301b, 501a, 501b First urging member 302a, 302b, 502a, 502b Second urging member 303a, 303b, 303c, 503a, 503b Third urging member 205a, 205b Concave shape 311a, 311b Projection

Claims (11)

A holding member that holds the optical member and
A first urging member formed on the holding member and urging the optical member in the optical axis direction and in a direction perpendicular to the optical axis direction.
A second urging member formed on the holding member and formed at a position different from that of the first urging member in the circumferential direction.
An optical device having a third urging member formed on the holding member and formed at a position closer to the second urging member than the first urging member in the circumferential direction.
When the optical device is not impacted, the second urging member contacts the optical member and urges the optical member in the optical axis direction and in the direction perpendicular to the optical axis.
The third urging member is not in contact with the optical member when the optical device is not impacted.
The third urging member is an optical device characterized in that when the optical device receives an impact, it comes into contact with the optical member and urges the optical member in the optical axis direction. The area in which the second urging member contacts the optical member when the optical device is not impacted is such that the third urging member contacts the optical member when the optical device is impacted. The optical device according to claim 1, which is smaller than the area to be used. The optical according to claim 1 or 2, wherein the urging force of the first urging member with respect to the optical member in the optical axis direction is larger than the urging force of the second urging member with respect to the optical member in the optical axis direction. apparatus. Claim 1 that the urging force in the direction perpendicular to the optical axis of the first urging member with respect to the optical member is larger than the urging force in the direction perpendicular to the optical axis of the second urging member with respect to the optical member. The optical device according to any one of 3 to 3. When the optical device is not impacted, the tip of the protrusion extending in the optical axis direction of the second urging member comes into contact with the protrusion extending in the direction perpendicular to the optical axis of the optical member. The optical member is urged in the direction of the optical axis and in the direction perpendicular to the direction of the optical axis.
When the optical device receives an impact, the tip of the protrusion extending in the optical axis direction of the third urging member comes into contact with the protrusion extending in the direction perpendicular to the optical axis of the optical member. The optical device according to any one of claims 1 to 4, which urges the optical member in the optical axis direction. When viewed from a direction perpendicular to the optical axis, a pair of the second urging members are provided symmetrically about the optical axis.
The optical device according to any one of claims 1 to 5, wherein the third urging member is provided symmetrically with respect to the optical axis when viewed from a direction perpendicular to the optical axis. When viewed from a direction perpendicular to the optical axis, the third pair of urging members symmetrically provided about the optical axis is a second pair of urging members symmetrically provided about the optical axis. The optical device according to claim 6, which is provided at a position closer to the center of the optical axis. When viewed from a direction perpendicular to the optical axis, a pair of the first urging members are provided symmetrically about the optical axis.
Each of the tips of the protrusions extending in the optical axis direction of the pair of first urging members is a protrusion extending in a direction perpendicular to the optical axis of the optical member when the optical device is not impacted. In contact with the optical member, the optical member is urged in the direction of the optical axis and in the direction perpendicular to the direction of the optical axis.
When viewed from the optical axis direction, the contact surface at which the optical member and the holding member abut is located at the root of each of the protrusions of the pair of first urging members.
The optical device according to claim 7, wherein the contact surface where the optical member and the holding member abut when viewed from the optical axis direction is located between the protrusions of the pair of third urging members. When viewed from a direction perpendicular to the optical axis, the claws at the tips of the protrusions extending in the optical axis direction of the pair of third urging members face outward with respect to the center of the optical axis. ,
When viewed from a direction perpendicular to the optical axis, the claws at the tips of the protrusions extending in the optical axis direction of the pair of second urging members face inward with respect to the center of the optical axis. The optical device according to claim 7. When viewed from a direction perpendicular to the optical axis, the claws at the tips of the protrusions extending in the optical axis direction of the pair of third urging members face outward with respect to the center of the optical axis. Item 8. The optical device according to item 8. The holding member can move in the optical axis direction along the sliding axis and can move in the optical axis direction.
When viewed from the optical axis direction, the second urging member and the third urging member are located closer to the sliding axis than the first urging member, claim 1 to 1. 10. The optical device according to any one of 10.

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