JP4505052B2 - Prism adjustment device - Google Patents

Description

  The present invention relates to a prism adjustment device that adjusts a prism mounting angle in an optical system including a prism, and more particularly, to an optical system of a small camera mounted on a portable information terminal such as a cellular phone or a portable personal computer, or the like. The present invention relates to a prism adjustment device that can be applied to an optical apparatus.

As a conventional optical system including a prism, in a device such as an optical pickup, a prism that bends light at a right angle is arranged between a tracking mirror and a moving optical system, and this prism is supported by a spherical seat. There is known an adjusting device for adjusting the angle of the prism so that the inclination of the incident optical axis and the outgoing optical axis of the prism can be adjusted (see, for example, Patent Document 1).
JP-A-5-189791

  By the way, in the above-described conventional prism adjusting device, the four corners of the prism are supported by the spherical seats formed on the holding member, so that the finishing accuracy of the spherical surface formed on the holding member is required. In the case of a small object that can fit in a cube of 5 mm to 10 mm, it is difficult to adjust the angle.

  The present invention has been made in view of the above-described prior art, and the object of the present invention is to easily reduce the mounting angle of the prism included in a part of the optical system while reducing the size of the apparatus. It can be adjusted and the assembly work of the entire optical system can be performed easily and with high accuracy, and is particularly suitable for the optical system of small cameras mounted on portable information terminals such as mobile phones and portable personal computers. It is another object of the present invention to provide a prism adjusting device.

The prism adjustment device of the present invention includes an optical system including a prism having an entrance surface, a reflection surface, and an exit surface, a holding member that holds the optical system, and an adjustment mechanism that adjusts the prism mounting angle. mechanism includes a shaft portion provided on the prism in a region other than the incident surface and exit surface, and a through hole provided in the holding member so as to insert the shaft portion rotatably, the shank, the reflective surface It is formed through a beam member straddled in a gate shape on the outer wall surface to be defined, and is formed so as to have an axis parallel to the main optical axis of the emitted light emitted from the emitting surface. It is characterized by.

According to this configuration, when the prism forming a part of the optical system is attached to the holding member, the prism mounting angle can be finely adjusted by rotating the shaft portion passed through the insertion hole of the holding member. .
Further, since the shaft portion is formed in a region other than the entrance surface and the exit surface, the light incident from the entrance surface is directed in a predetermined direction on the reflection surface without affecting the light bending (reflection) characteristics. It bends and is reflected and emitted from the exit surface.
Furthermore, since the shaft portion is not provided directly on the outer wall surface but via a beam member separated from the reflecting surface, it has no effect on the effective area (light reflecting area) of the reflecting surface. And desired optical characteristics (reflection characteristics) can be obtained.

In the above configuration, the holding member can employ a configuration including a main body having a support portion that supports the outer edge portion of the injection surface, and a cover that has an insertion hole and can be joined to the main body.
According to this configuration, when assembling the prism, the outer edge portion of the exit surface is joined to the support portion of the main body, the shaft portion is passed through the insertion hole and the cover portion is joined to the main body, and then the shaft portion is rotated. By doing so, the angle of the prism can be finely adjusted.

The said structure WHEREIN: The structure for which the groove | channel for connecting a tool is formed in the end surface of an axial part is employable.
According to this configuration, the angle of the prism can be easily adjusted by connecting a tool (for example, a minus or plus screw driver) to a groove (for example, a minus groove or a cross groove) formed on the end face of the shaft portion. be able to.

The prism adjustment device of the present invention includes an optical system including a prism having an entrance surface, a reflection surface, and an exit surface, a holding member that holds the optical system, and an adjustment mechanism that adjusts the prism mounting angle. The adjusting mechanism includes a groove provided in the prism in a region other than the entrance surface and the exit surface, and a through hole provided in the holding member so as to expose the groove.
According to this configuration, when a prism forming a part of the optical system is attached to the holding member, a tool or the like is connected to the groove through the through hole of the holding member and rotated to finely adjust the prism mounting angle. Can do. Further, since the groove is formed in a region other than the incident surface and the exit surface, the light incident from the incident surface is bent in a predetermined direction on the reflecting surface without affecting the light bending (reflection) characteristics. And reflected from the exit surface.

The said structure WHEREIN: The groove | channel is provided in the four corners on the outer wall surface which demarcates a reflective surface, and the structure by which a through-hole is provided corresponding to the groove | channel of four corners is employable.
According to this configuration, the angle of the prism can be easily adjusted by inserting and connecting a dedicated tool or the like from the corresponding four through holes to the four grooves provided at the four corners, and appropriately rotating the four grooves. it can.

  According to the prism adjusting device of the present invention having the above-described configuration, when a prism constituting a part of the optical system is attached to the holding member (when the optical system is assembled), the light bending (reflection) characteristic is affected. The prism mounting angle can be finely adjusted, and desired optical characteristics can be obtained.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 8 show an embodiment of a camera unit provided with a prism adjustment device according to the present invention. FIG. 1 is a front view of the camera unit, FIG. 2 is a side view of the camera unit, FIG. 4 is a sectional view showing the inside of the camera unit, FIGS. 5 and 6 are exploded perspective views and end views showing the prism adjusting device, FIG. 7 is a sectional view of the cam cylinder, and FIG. 8 is a sectional view of the camera unit.

  As shown in FIGS. 1 to 5, the camera unit includes an outer cylinder 10 and a cover 20 as a holding member (main body) that holds and holds a lens G1, a prism G2, a lens G3, and a lens G4 constituting an optical system. The cam cylinder 30 that is rotatably supported around the optical axis L 2 inside the outer cylinder 10, the lens frame 40 that holds the lens G 3, the lens frame 50 that holds the lens G 4, and the lens frame 40 and the lens frame 50. A compression spring 60 disposed between them, a manual operation unit 70 disposed so as to be rotatable along the outer cylinder 10, and a CCD 80 and a CCD 80 serving as an imaging device disposed behind the lens frame 50 (lens G4) are held. A holding frame 90 and the like are provided.

In this camera unit, the lens G1 and the prism G2 form a first lens group, the lens G3 (and the lens frame 40) forms a second lens group, and the lens G4 (and the lens frame 50) forms a third lens group, respectively. When the subject light enters from the L1 direction, it is bent at approximately a right angle (direction change) by the prism G2, travels in the L2 direction, and reaches the CCD 80 via the lens G3 and the lens G4.
Then, the second lens group (lens G3) and the third lens group (lens G4) are moved relative to each other in the optical axis direction L2, so that the zooming operation and focusing of the subject with respect to the imaging surface of the CCD 80 are performed. A focusing operation is performed. A crystal filter and a face plate are disposed between the CCD 80 and the lens G4.

  The outer cylinder 10 is formed by joining a pair of halves formed of a resin material. As shown in FIGS. 3, 4, and 8, the outer cylinder 10 rotatably supports the cam cylinder 30, and An opening 11 through which the protruding piece 35 is inserted, a guide groove 12 for guiding the lens frames 40 and 50 in the optical axis direction L2, and a flat joining surface 13a as a support part for joining the cover 20 and supporting the prism G2. A joining portion 13, a substantially rectangular opening 14 formed in the joining portion 13, a joining portion 15 that joins the holding frame 90, and the like are provided.

  As shown in FIGS. 1 to 5, the cover 20 is bonded and fixed to the outer cylinder 10 in a state where the lens G1 and the prism G2 are accommodated, and has an opening 21 and an outer cylinder positioned in front of the lens G1. The edge part 22 joined to 10 joining parts 13 and the circular insertion hole 23 etc. which were formed in a part of the wall surface are provided.

As shown in FIGS. 3 to 5, the prism G2 includes an incident surface g1 on which subject light is incident, a reflecting surface g2 that bends (changes in direction) the subject light incident from the direction of the optical axis L1, and bent subject light. A beam member g4 straddling in a gate shape on the outer wall surface g2 ′ (that is, the region other than the incident surface g1 and the emission surface g3) that defines the reflecting surface g2 On the member g4, there are provided a cylindrical shaft portion g5 formed by extending in the direction of the optical axis L2, a groove g5 ′ formed on the end face of the shaft portion g5, and the like. That is, since the shaft portion g5 is not provided directly on the outer wall surface g2 ′ but via the beam member g4, a desired bending (reflection) characteristic is ensured on the reflection surface g2.
Here, the shaft part g5 is formed so that its axis is coaxial with the optical axis L2, but it may be formed so that the axis is slightly deviated from and parallel to the optical axis L2.

And the outer edge part g3 'of the injection | emission surface g3 is contact | abutted to the joint surface 13a of the outer cylinder 10, and the cover 20 (edge part 22) is made to insert the outer cylinder 10 ( When joined to the joining portion 13), the shaft portion g5 is rotatably supported by the insertion hole 23 so that the prism G2 can be finely adjusted to a desired angular position around the optical axis L2 while sliding on the joining surface 13a. It has become.
In other words, the shaft g5 formed in the prism G2 and the insertion hole 23 formed in the cover 20 constitute an adjustment mechanism that adjusts the mounting angle of the prism G2.

  As shown in FIGS. 3, 4, and 8, the cam cylinder 30 is rotatably supported inside the outer cylinder 10 and moves the lens frames 40 and 50 in the optical axis direction L2. 7, two cam surfaces 31 and 32 (one is not shown) formed on the inner peripheral surface and exerting a cam action on the lens frames 40 and 50 in the optical axis direction L <b> 2, and wall surfaces are cut away. It is formed by one cam surface 33, 34 that is formed at the edge and exerts a cam action on each of the lens frames 40, 50 in the optical axis direction L2, and a protruding piece 35 that protrudes radially outward. The cam cylinder 30 is divided into two parts in the optical axis direction L2 and separately formed. After the lens frames 40 and 50 are fitted with the compression spring 60 interposed therebetween, the cam cylinder 30 is assembled and integrated.

  Here, the two cam surfaces 31 and one cam surface 33 come into contact with three followers 42 of the lens frame 40 described later, respectively, and exert a cam action in the optical axis direction L2, and the two cam surfaces 32 and One cam surface 34 comes into contact with three followers 52 of a lens frame 50 described later, and exerts a cam action in the optical axis direction L2. Therefore, when the cam cylinder 30 rotates, the lens frames 40 and 50 are moved in the optical axis direction L2, respectively.

As shown in FIGS. 1 to 4 and 8B, the manual operation portion 70 is formed in an arc shape, and a fitting hole 71 into which the protruding piece 35 of the cam cylinder 30 is fitted is formed in the substantially central portion thereof. Has been. And the manual operation part 70 is slidably attached around the outer cylinder 10, as shown in FIG.1 and FIG.8 (b).
Accordingly, when the manual operation unit 70 is rotated, the cam cylinder 30 is rotated integrally with the rotation, and the lens frames 40 and 50 are moved in the optical axis direction L2.

  As shown in FIGS. 3, 4, and 8B, the lens frame 40 holds the lens G3 and is disposed inside the cam cylinder 30 so as to be movable in the optical axis direction L2. The lens frame 40 is formed in a substantially cylindrical shape by a resin material, and is formed by holding holes 41 that hold the lens G3, three followers 42 that are arranged at intervals of 120 degrees and protrude outward in the radial direction. Yes. One follower 42 is formed longer than the other and is inserted into the guide groove 12 of the outer cylinder 10.

  That is, as shown in FIGS. 3 and 4, two followers 42 abut against the cam surface 31 of the cam cylinder 30, and one follower 42 abuts the cam surface 33 and is inserted into the guide groove 12. Thereby, the lens frame 40 is moved only in the optical axis direction L2 following the cam profile of the cam surfaces 31 and 33 while the rotation is restricted by the guide groove 12.

  As shown in FIGS. 3, 4, and 8 (a), the lens frame 50 holds the lens G <b> 4 and is disposed inside the cam cylinder 30 so as to be movable in the optical axis direction L <b> 2. The lens frame 50 is formed in a substantially cylindrical shape by a resin material, and is formed by holding holes 51 that hold the lens G4, three followers 52 that are arranged at intervals of 120 degrees and protrude outward in the radial direction, and the like. Yes. Note that one follower 52 is formed longer than the other and is inserted into the guide groove 12 of the outer cylinder 10.

  That is, as shown in FIGS. 3 and 4, the two followers 52 are in contact with the cam surface 32 of the cam cylinder 30, and the one follower 52 is in contact with the cam surface 34 and inserted into the guide groove 12. Accordingly, the lens frame 50 is moved only in the optical axis direction L2 following the cam profile of the cam surfaces 32 and 34 while the rotation is restricted by the guide groove 12.

  Next, the assembly of the prism G2 and the adjustment of the mounting angle in the camera unit will be described. First, the lens frame 40 and the lens frame 50 are assembled in the cam cylinder 30, and the cam cylinder 30 is assembled in the outer cylinder 10 so as to be rotatable. Then, the holding frame 90 holding the CCD 80 is assembled to the joint portion 15 of the outer cylinder 10.

Subsequently, as shown in FIGS. 3 and 4, the edge of the lens G1 and the exit surface g3 (outer edge g3 ′) of the prism G2 are joined to the joint 13 and the joint surface 13a of the outer cylinder 10, The cover 20 is bonded and fixed to the bonding portion 13 so that the lens G1 is fixed and the shaft portion g5 is inserted through the insertion hole 23 to the outside.
In this assembled state, when the shaft portion g5 is rotated using a tool (for example, a negative screwdriver is connected to the groove g5 ′ of the shaft portion g5 to rotate), the prism G2 is moved on the joint surface 13a. The mounting angle (the direction of the optical axis L1) can be adjusted by rotating around the optical axis L2 while sliding.

  Subsequently, an imaging chart for adjustment is arranged in front of the lens G1, and the CCD 80 is driven to display an image of the imaging chart on the monitor. Then, while confirming the image on the monitor so as to obtain a desired clear image state, as shown in FIG. 6, the shaft portion g5 is appropriately rotated to finely adjust the mounting angle of the prism G2. When a desired image is obtained, the prism G2 is fixed to the cover 20 (and the outer cylinder 10) by filling the shaft portion g5 and the insertion hole 23 with an adhesive so as to maintain the mounting angle. Thereby, the assembly and angle adjustment of the prism G2 are completed.

  Thus, by rotating the shaft portion G5 passed through the insertion hole 23 of the cover 20, the mounting angle of the prism G2 can be finely adjusted, so that the angle adjustment becomes easy and the entire assembling work is smooth. Can improve productivity. In particular, even when the size of the prism G2 is relatively small so as to fit in a cube having a side of about 5 mm to 10 mm, the mounting angle can be easily and precisely adjusted.

  Next, the operation of the camera unit will be described with reference to FIGS. 3 and 4. When the manual operation unit 70 is rotated in one direction, the cam action of the cam surfaces 31, 33 and the cam surfaces 32, 34 results in FIG. As shown, the lens frame 40 (lens G3) and the lens frame 50 (lens G4) move toward the front side in the optical axis direction L2 while changing the relative distance to reach the wide-angle shooting position.

On the other hand, when the manual operation unit 70 is rotated in the opposite direction, the cam action of the cam surfaces 31 and 33 and the cam surfaces 32 and 34 causes the lens frame 40 (lens G3) and the lens frame 50 (lens) as shown in FIG. G4) moves toward the rear side in the optical axis direction L2 while changing the relative distance to reach the telephoto shooting position.
In this way, the manual operation unit 70 can be rotated to take a picture in a wide range from a wide angle to a telephoto, and in particular, a photographed image having excellent optical characteristics can be obtained by the camera unit equipped with this prism adjustment device. be able to.

  In the above-described embodiment, in the configuration of the prism G2, a clearance is provided between the upper surface of the beam member g4 and the inner wall surface of the cover 20, but the cover 20 can be formed so as to be in contact with both. Thus, the prism G2 may be pressed and held moderately against the joint surface 13a, and in this state, the shaft portion g5 may be rotated to finely adjust the mounting angle.

  9 to 11 show a camera unit that employs another embodiment of the prism adjusting device according to the present invention. The same components as those of the above-described embodiment are denoted by the same reference numerals and the description thereof is omitted. Omitted. In this embodiment, as shown in FIGS. 9 to 11, the cover 20 ′ is bonded and fixed to the outer cylinder 10 in a state in which the lens G1 and the prism G2 ′ are accommodated, and in front of the lens G1. There are provided an opening 21, a rim 22 joined to the joint 13 of the outer cylinder 10, four substantially rectangular through holes 23 'formed at the four corners of the wall surface, and the like. Here, the four through holes 23 'are formed so as to be located on the same radius from the optical axis L2.

  As shown in FIGS. 9 to 11, the prism G2 ′ includes an incident surface g1 on which subject light is incident, a reflective surface g2 that bends (changes in direction) the subject light incident from the direction of the optical axis L1, and a bent subject. An exit surface g3 that emits light in the direction of the optical axis L2, and four grooves g6 provided at four corners of an outer wall surface g2 ′ that defines the reflection surface g2 (that is, a region other than the entrance surface g1 and the exit surface g3) are provided. ing. Here, the four grooves g6 are formed so as to be located on the same radius from the optical axis L2.

Then, the outer edge portion g3 ′ of the injection surface g3 is brought into contact with the joint surface 13a of the outer cylinder 10, and the through hole 23 ′ of the cover 20 ′ is opposed to the groove g6, so that the cover 20 ′ (edge portion 22). Is joined to the outer cylinder 10 (joining portion 13), the groove g6 is exposed through the through hole 23 '. Therefore, by connecting a dedicated tool to the groove g6 from the outside of the through-hole 23 and rotating it around the optical axis L2, the prism G2 'slides on the joint surface 13a to a desired angular position around the optical axis L2. Tweaked.
In other words, the groove g6 formed in the prism G2 ′ and the through hole 23 ′ formed in the cover 20 ′ constitute an adjustment mechanism that adjusts the mounting angle of the prism G2 ′.

  Next, the assembly of the prism G2 ′ and the adjustment of the mounting angle in this mela unit will be described. First, the lens frame 40 and the lens frame 50 are assembled in the cam cylinder 30, and the cam cylinder 30 is assembled in the outer cylinder 10 so as to be rotatable. Then, the holding frame 90 holding the CCD 80 is assembled to the joint portion 15 of the outer cylinder 10.

  Subsequently, as shown in FIGS. 9 and 11, the edge of the lens G1 and the exit surface g3 (outer edge g3 ′) of the prism G2 ′ are joined to the joint 13 and the joint surface 13a of the outer cylinder 10. The cover 20 ′ is bonded to the bonding portion 13 and fixed so that the lens G1 is fixed and the through hole 23 ′ is opposed to the groove g6.

  Subsequently, an imaging chart for adjustment is arranged in front of the lens G1, and the CCD 80 is driven to display an image of the imaging chart on the monitor. Then, while confirming the image on the monitor so as to obtain a desired clear image state, a dedicated tool is inserted from the through hole 23 'and connected to the groove g6, and appropriately rotated as shown in FIG. Finely adjust the mounting angle of the prism G2 '. Then, when a desired image is obtained, the prism G2 ′ is fixed to the cover 20 ′ (and the outer cylinder 10) by filling the through hole 23 ′ and the groove g6 with an adhesive so as to maintain the mounting angle. . Thereby, the assembly and angle adjustment of the prism G2 ′ are completed.

In this way, by inserting a dedicated tool through the through hole 23 ′ of the cover 20 ′, connecting it to the groove G 6 and rotating it appropriately, the mounting angle of the prism G 2 ′ can be finely adjusted, so that the angle adjustment is easy. Thus, the entire assembly work can be performed smoothly, and productivity is improved. In particular, even if the size of the prism G2 ′ is relatively small so that it can fit in a cube having a side of about 5 mm to 10 mm, the mounting angle can be easily and finely adjusted.
In this embodiment, the cover 20 ′ is formed separately from the outer cylinder 10. However, the present invention is not limited to this. The cover 20 ′ is inserted on the joint surface 13 a by inserting the prism G 2 ′ from the opening 21. 20 ′ may be formed integrally with the outer cylinder 10.

  In the above embodiment, the case where the prism adjusting device according to the present invention is employed in the optical system in which the prism G2 is arranged in the middle of the lens G1, the lens G3, and the lens G4 that are sequentially arranged has been described. The prism adjusting device according to the present invention may be applied to an optical system in which a prism is added to two lenses or four or more lenses, and the prism adjusting device of the present invention is applied to other optical systems. May be applied.

  As described above, the prism adjustment device according to the present invention can easily adjust the mounting angle of the prism included in the optical system with high accuracy, so that it can be applied to ordinary optical equipment. In particular, it is useful for an optical system in a small digital camera mounted on a portable information terminal such as a cellular phone or a portable personal computer.

It is a front view which shows the camera unit provided with the prism adjustment apparatus which concerns on this invention. It is a side view which shows the camera unit provided with the prism adjustment apparatus which concerns on this invention. It is sectional drawing of the camera unit shown in FIG.1 and FIG.2. It is sectional drawing of the camera unit shown in FIG.1 and FIG.2. It is a disassembled perspective view which shows the relationship between the outer cylinder, prism, and cover which comprise a part of camera unit. It is the end view which looked at the camera unit from the cover side. It is sectional drawing which shows the cam cylinder which comprises a part of camera unit. (A), (b) is sectional drawing seen from the optical axis direction which shows the inside of a camera unit. It is sectional drawing of the camera unit which shows other embodiment of the prism adjustment apparatus which concerns on this invention. It is a disassembled perspective view which shows the relationship between the outer cylinder, prism, and cover which comprise some camera units shown in FIG. It is the end view which looked at the camera unit shown in FIG. 9 from the cover side.

Explanation of symbols

G1, G3, G4 lens (optical system)
G2, G2 'prism (optical system)
g1 incident surface g2 reflecting surface g2 ′ outer wall surface g3 exit surface g3 ′ outer edge portion g4 beam member g5 shaft portion (adjustment mechanism)
g5 'groove g6 groove (adjustment mechanism)
L1 Optical axis L2 Optical axis (main optical axis of emitted light)
10 Outer cylinder (holding member, main body)
13 joint part 13a joint surface (support part)
20, 20 'cover (holding member)
21 Opening 22 Edge 23 Insertion hole (adjustment mechanism)
23 'through hole (adjustment mechanism)
40, 50 Lens frame 60 Compression spring 70 Manual operation unit 80 CCD
90 Holding frame

Claims (5)

An optical system including a prism having an entrance surface, a reflection surface, and an exit surface; a holding member that holds the optical system; and an adjustment mechanism that adjusts an attachment angle of the prism;
The adjusting mechanism, viewed including said entrance and exit surfaces other than the shaft portion provided on the prism in the region of the insertion hole formed in the holding member so as to inserting the shaft portion rotatably, and ,
The shaft portion is formed through a beam member straddled in a gate shape on the outer wall surface that defines the reflecting surface, and is axially parallel to the main optical axis of the emitted light emitted from the emitting surface Formed to have
A prism adjustment device characterized by that. The holding member includes a main body having a support portion that supports an outer edge portion of the emission surface, and a cover that has the insertion hole and can be joined to the main body.
The prism adjustment device according to claim 1 , wherein: A groove for connecting a tool is formed on the end surface of the shaft portion.
The prism adjustment device according to claim 1 or 2 , wherein An optical system including a prism having an entrance surface, a reflection surface, and an exit surface; a holding member that holds the optical system; and an adjustment mechanism that adjusts an attachment angle of the prism;
The adjustment mechanism includes a groove provided in the prism in a region other than the entrance surface and the exit surface, and a through hole provided in the holding member so as to expose the groove.
A prism adjustment device characterized by that. The grooves are provided at four corners on an outer wall surface that defines the reflecting surface,
The through holes are provided corresponding to the grooves at the four corners,
The prism adjustment device according to claim 4 .

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