JPH0980286A - Light shielding mask and lens barrel using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and easily house and attach a light shielding mask in narrow space in a lens barrel by providing the light shielding mask with plural projected ribs to be fixed to a member housed in a housing. SOLUTION: The outside diameter of the projection 71a of a bottom board 71 is fit in the inside diameter of a fixed barrel 62 constituting the lens barrel 61, and the bottom board 71 is fixed on the fixed barrel 62 by a lens barrel roller. The light shielding mask 717 is arranged between a 1st group lens 63 and a 2nd group lens 74. The plural projected ribs 717a are formed on the circumference of the mask 717. The tip parts of the ribs 717a are fixed on a double coated tape 13 arranged on a hard base plate 715. The end t1 of the rib 717a is almost equal to the molding thickness t2 of the mask 717. Or the mask 717 is provided with a rib as a force fit part, and the mask 717 is fixed on the base plate 715 by pushing the rib in the package of an IC mounted on the base plate 715.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding mask and a lens barrel using the same, and for example, to efficiently provide the light-shielding mask in a narrow space inside the lens barrel having optical members such as lenses and diaphragms housed in the casing. The unnecessary light of the photographing light flux entering the housing from the outside is effectively shielded.

[0002]

2. Description of the Related Art Conventionally, in a lens barrel used for a photographic camera, a video camera or the like, a light-shielding mask having a predetermined opening is provided in the optical path, and an image is incident on the lens barrel. Of the light flux, unnecessary light is blocked so as not to reach the image pickup surface.

Conventionally, in many lens barrels, when attaching the light-shielding mask to the lens barrel, it is fixed and stored in other members in the lens barrel by using, for example, screws. .

[0004]

The method of using a screw to attach the light-shielding mask to the lens barrel requires a space corresponding to the length of the screw (screw length) in the lens barrel. For this reason, the method using the screws tends to lengthen the lens barrel. Further, since the screw is exposed on the outer appearance, it is necessary to attach a member for covering the screw, which tends to complicate the working process.

The present invention efficiently and easily accommodates and attaches in a narrow space in the lens barrel, has no discomfort in appearance, and eliminates the need for a light flux entering the lens barrel from the outside. An object of the present invention is to provide a light-shielding mask that blocks light and a lens barrel using the same.

[0006]

The light-shielding mask of the present invention is (1-1) provided in a part of a housing for housing an optical member to prevent unnecessary light in a light beam entering the housing from the outside. A light-shielding mask for shielding light, the light-shielding mask having substantially the same thickness as the molding thickness thereof, and having a plurality of convex ribs for fixing to a member housed in the housing. Is characterized by.

In particular, (1-1-1) the plurality of ribs are provided in a partial area on a concentric circle centered on the central axis of the housing on a flat plate.

(1-2) A light-shielding mask which is provided in a part of a housing for accommodating an optical member and which shields unnecessary light in a light beam entering the housing from the outside, the light-shielding mask Has a plurality of light-shielding grooves concentric with the central axis of the housing on its light-incident side surface, and the light-shielding groove for fixing to a member housed in the housing on its light-incident side surface. It is characterized by having a plurality of in-phase arc-shaped and convex ribs.

(1-3) A light-shielding mask which is provided in a part of a housing for accommodating an optical member and which shields unnecessary light in a light beam entering the housing from the outside. Is characterized by having a plurality of ribs for fixing the electronic components housed in the housing to a part of a substrate on which the electronic components are mounted, and a groove portion for complementing the shape of the electronic components on the substrate. .

(1-4) A light-shielding mask which is provided in a part of a housing for accommodating an optical member and which shields unnecessary light in a light beam entering the housing from the outside, the light-shielding mask Has a press-fitting portion for press-fitting into the electronic component of a board on which the electronic component housed in the housing is mounted.

(1-5) A light-shielding mask which is provided in a part of a housing for accommodating an optical member and which shields unnecessary light of a light beam entering the housing from the outside, the light-shielding mask Has a metal pin for soldering and fixing it to a part of the substrate housed in the housing.

(1-6) A light-shielding mask which is provided in a part of a housing for accommodating an optical member and shields unnecessary light in a light beam entering the housing from the outside. Is characterized by having a fixing portion for fixing to a joining member mounted on a substrate adjacent thereto.

The lens barrel of the present invention has the above-mentioned structural requirements (1-
It is characterized in that a light-shielding mask having at least one of the requirements 1) to (1-6) is used.

The optical device of the present invention has the above-mentioned requirements (1-
It is characterized in that an image is formed on a predetermined surface by using a lens barrel using a light-shielding mask having at least one of the constitutional requirements 1) to 1-6.

[0015]

1 is a perspective view of a main part of a first embodiment when a lens barrel having a light-shielding mask of the present invention is applied to an optical device using a vibration isolation system. In the figure, the rear protruding ears 71a of the main plate 71 (three locations are provided in the figure, but two locations are shown in the figure) are fitted to a lens barrel (not shown), and a known lens barrel roller or the like is formed into a hole. It is screwed to 71b and fixed to the lens barrel.

A second yoke (fixed portion) 72 made of a magnetic material and having a bright plating is screwed into a hole 71c of a base plate 71 with a screw penetrating a hole 72a provided on the circumference. A permanent magnet 73 (shift magnet) such as a neodymium magnet is magnetically attracted to the second yoke 72. The arrow 73a indicates the magnetization direction of each permanent magnet 73. 74 is a lens as an optical element for image stabilization. The coils 76p and 76y (shift coils) are patch-bonded to a support frame 75 to which the lens 74 is fixed with a C-ring or the like.
Light emitting elements 77p and 77y such as IRED are also adhered to the back surface of the support frame 75. Light fluxes from the light projecting elements 77p and 77y pass through the slits 75ap and 75ay and are described later in PSD.
And the like, and enters the position detecting elements 78p and 78y.

The holes 75b (three places) of the support frame 75 are shown in FIG.
As shown in FIG.
b and the charge spring 710 are loaded, and the support sphere 79a is heat caulked and fixed to the support frame 75 (the support sphere 79).
b is slidable in the extending direction of the hole 75b against the spring force of the charge spring 710. ).

FIG. 2 is a cross-sectional view of the lens barrel after assembly, in which a support ball 79b, a charged charge spring 710, and a support ball 79a are inserted in the hole 75b of the support frame 75 in the direction of arrow 79c in this order. And then (support balls 79a, 79
(b is a component of the same shape) Finally, the peripheral end portion 75c of the hole 75b is thermally caulked to prevent the support ball 79a from coming off.

FIG. 3 is a cross-sectional view of a main part orthogonal to the hole 75b of FIG. 2, and FIG. 4 is a plan view of the main part when viewed from the direction of arrow 79c of FIG. Each point A to D in FIG. 4 corresponds to each point A to D in FIG. Here, the rear end of the blade portion 79aa of the support ball 79a is received and regulated in the range of the depth A surface. For this reason, the support ball 79a is fixed to the support frame 75 by thermally caulking the peripheral end portion 75c.

The tip of the blade portion 79ba of the support ball 79b is received within the depth B plane. For this purpose, support balls 79
b is prevented from coming off from the hole 75b in the direction of arrow 79c by the charge spring force of the charge spring. When the assembling of the lens barrel is completed, the support ball 79b moves to the second position.
Received by the yoke 72. For this reason, although it does not come out of the support frame 75, the B surface is provided in the retaining area in consideration of the assemblability.

2 to 4, holes 75b in the support frame 75
Does not require a complicated inner diameter slide mold even when the support frame 75 is formed by molding, and can be molded by a simple two-part mold in which the mold is pulled out on the side opposite to the arrow 79c, so that dimensional accuracy can be set strictly accordingly. Like that.

Further, since the support balls 79a and 79b are the same parts, there is no assembly error, which is advantageous in parts management. In FIG. 1, for example, fluorine-based grease is applied to the bearing 75 d of the support frame 75, and an L-shaped shaft 711 (a non-magnetic stainless material) is charged, and the other end of the L-shaped shaft 711 is formed on the main plate 71. The bearing frame 71d (similarly coated with grease) is placed on the second yoke 72 together with the three supporting balls 79b, and the support frame 75 is housed in the base plate 71.

Next, the positioning hole 712 of the first yoke 712.
a (three places) are pins 71f of the main plate 71 (three places in FIG. 5)
To the first yoke 7 at the receiving surfaces 71e (five places).
12 and is magnetically coupled to the base plate 71 (the magnetic force direction 73a of the permanent magnet 73). Thereby, the first yoke 7
The rear surface of the base 12 is in contact with the support ball 79a, and the support frame 75 is sandwiched between the first yoke 712 and the second yoke 72 as shown in FIG.

Support balls 79a, 79b and first yoke 712
Fluorine-based grease is also applied to the contact surfaces of the first and second yokes 72, and the support frame 75 is freely slidable with respect to the base plate 71 in a plane orthogonal to the optical axis. The L-shaped shaft 711 has the support frame 75 with the arrows 713p, 7
It is supported so that it can slide only in the 13y direction,
This restricts the relative rotation (rolling) of the support frame 75 with respect to the base plate 71 about the optical axis.

The L-shaped shaft 711 and the bearings 71d and 75d
Is set to be large in the optical axis direction to prevent overlapping with the optical axis direction regulation by sandwiching the support balls 79a and 79b with the first yoke 712 and the second yoke 72. . The insulating sheet 7 is provided on the surface of the first yoke 712.
14 is covered with a plurality of ICs (position detecting element 7
8p, 78y, output amplification IC, coil (75p, 76y
y), a hard substrate 715 having a driving IC, etc.) is fitted in the positioning holes 715a (two places) with the pins 71h (two places in FIG. 5) of the base plate 71, and the holes 715b and the first yoke 71 are formed.
The second hole 712b and the hole 71g of the base plate 71 are screwed together.

Position detecting elements 78p and 78y are positioned on the hard board 715 by a tool and fixed by soldering. Flexible board 71 for signal transmission
6, the surface 716a is thermocompression-bonded to a region 715c surrounded by a broken line on the back surface of the hard substrate 715. Flexible board 71
6 and a pair of arms 716b in a plane direction orthogonal to the optical axis.
p and 716by extend, and are hooked on hook portions 75ep and 75ey of the support frame 75, respectively, as shown in FIG. 6, and the terminals of the IREDs 77p and 77y and the coils 76p and 76y.
The terminal of y is soldered.

As a result, IRED 77p, 77y and coil 7
6p and 76y are driven from the hard substrate 715 via the flexible substrate 716. The bent portions 7 are respectively provided on the arm portions 716bp and 716by of the flexible substrate 716.
16 cp and 716 cy are provided.
The arm 716b against the support frame 75 moving around in a plane orthogonal to the optical axis due to the elasticity of 16cp and 716cy.
The load of p, 716by is reduced.

The first yoke 712 has a protruding surface 712c formed by embossing, and the protruding surface 712c passes through the hole 714a of the insulating sheet 714 and is in direct contact with the hard substrate 715. On the hard board 715 side of this contact surface, a ground (GN
D; ground) pattern is formed, and the first yoke 71 is formed by screwing the hard substrate 715 to the ground plate 71.
Numeral 2 is grounded so that it does not act as an antenna to give noise to the hard substrate 715. 717
Is a light-shielding mask according to the present invention, which shields unnecessary light from the light flux entering the lens barrel.

The light shielding mask 717 is used for the base plate 7 as described later.
It is positioned on the first pin 71h and is fixed on the hard substrate 715 by a double-sided tape. The base plate 71 has a through hole 71i for a permanent magnet, from which the back surface of the second yoke 72 is exposed. A permanent magnet 718 (lock magnet) provided on the yoke 727 is incorporated in the through hole 71i and magnetically coupled to the second yoke 72 (FIG. 2).

Next, the light shielding mask 717 in this embodiment.
The features of the configuration and the mounting method thereof will be described. FIG. 15 shows a mask (light-shielding mask) 717 in this embodiment.
FIG. 9 is a cross-sectional view of an essential part when is accommodated in a part of a lens barrel 61.

In the figure, the outer diameter of the projection 71a of the base plate 71 is fitted to the inner diameter of the fixed barrel 62 which constitutes the lens barrel 61, and the base plate 71 is fixed to the fixed barrel 62 by the lens barrel roller.
The mask 717 is provided between the first group lens 63 and the lens 74 (second group lens). The distance between the two lens groups is extremely narrow. The mask 717 is made as thin as possible in order to be placed in this narrow space. Therefore, it is difficult to fix the mask 717 by using the conventional fixing method using screws.

Therefore, in this embodiment, the shape of the mask 717 is appropriately set so that the mask 717 is attached to a part of the hard substrate 715.

Next, in the present embodiment, the hard substrate 715.
A configuration for attaching the mask 717 to the will be described. FIG. 16 is a plan view of the back surface of the mask 717 (the surface seen from the right side to the left side of the paper surface of FIG. 1). The cross-sectional view taken along the alternate long and short dash line AA, BB, and CC shown in FIG. 17A and 17B together with the substrate 715, respectively. FIG.
As shown in (B), the mask 717 is taken in the section BB.
There is a space between the hard substrate 715 and the hard substrate 715 and they are not connected to each other. In a cross section AA shown in FIG. 17A, an electronic component provided on the hard substrate 715, for example, IC732.
Therefore, the mask 717 is made thin only in this portion (frames 11 and 12 in FIG. 16).

Generally, if the entire thickness of the mask 717 is made uniform and the mask 717 is molded to this thickness, the rigidity may be weak and the mask 717 may be deformed. On the contrary, make the thickness of the mask even and
Moreover, in order to include the IC 732, it is necessary to make the mask thick. Therefore, in this embodiment, the IC of the mask
Only the part where is is thin. Or I on the mask
A groove portion that complements the shape of C is provided.

In the cross section C--C shown in FIG. 17C, the mask 717 has a plurality of convex ribs 717a on the circumference thereof, and the tips of the ribs 717a are the hard substrate 715.
It is fixed to the double-sided tape 13 provided above.

Next, the mounting procedure at this time will be described with reference to FIG. As shown in the figure, the hard substrate 7
The double-faced tape 13 is attached to 15 beforehand, and the mask 7
The holes 717b and 717c on the back surface of 17 are fitted to and pressed by the positioning pins 71h of the base plate 71 so that the double-sided tape 13 and the vertices of the ribs 717a are adhered and attached.

Here, a description will be given of the case where the mounting surface of the mask 717 on the double-sided tape 13 has a plurality of ribs. As described above, the mask 717 is formed thin to reduce the thickness. At this time, if the adhesive portion is a single convex portion 717d as shown in FIG. 17D, a sink mark at the time of molding shown by an arrow 717e is formed on the external portion of the mask 717, which is not preferable. However sink marks hardly occur when the width t ₁ as in FIG. 17 (C) is integrally molded substantially equal (and evenly meat) rib 717a and the molded meat t ₂ of the mask 717,
The appearance also improves. At this time, the adhesion area of one rib 717a with the hard substrate 715 is small, and the attachment rigidity of the mask 717 to the hard substrate 715 becomes unstable.

Therefore, in this embodiment, a plurality of ribs are provided to widen the adhesive area as a whole to ensure the attachment. The ribs 717a are provided concentrically from the center O in FIG. Therefore, even if a slight sink mark remains at the time of molding, it is not conspicuous in appearance because it becomes several concentric grooves from the center of the mask 717. Further, by providing a light-shielding groove on the outer surface, the sink mark is not seen at all.

FIG. 19 is an enlarged explanatory view of FIG. 17 (C). As shown in the figure, a plurality of concentric light-shielding grooves 717f are provided on the light incident side surface of the mask 717, and an integer multiple of this interval (three cases are shown in the figure) is indicated by a broken line 717g.
As shown in, the ribs 717a have the same pitch and phase. The light-shielding groove 717f is provided with a mask 71 as shown in FIG.
The rib 71 is provided almost all over the appearance of
Even if a slight sink mark due to 7a occurs, this sink mark will be
Since it is in phase with 7f and has the same pitch, it is designed to be completely invisible from the outside.

Of course, even in the case of the rib shape which causes a large sink mark as shown in FIG. 17D, a decorative groove or the like may be provided on the outer appearance side to make it inconspicuous.

In FIG. 17C, the sink marks are prevented by forming the ribs 717a to have the same thickness as the mask 717, but the sink marks can be made smaller by making the ribs 717a thinner.
Further, as shown in FIG. 20, the thickness t ₃ of the rib 21a is set to the mask 71.
The thickness may be made thinner than the molding thickness t ₂ of No. 7 so that the sink marks generated on the external surface of the mask 717 are inconspicuous.

In this case, one hard substrate 7 per rib
Since the adhesion area to 15 is further narrower than that of FIG. 17C, the number of ribs is larger than that of the example of FIG. 17C to ensure the attachment.

FIG. 7 is a schematic view of the lens barrel after assembling each element in the present embodiment shown in FIG. 1 when viewed from the rear direction of FIG. The outer diameter cutouts 719c (three locations in FIG. 8) of the lock ring (locking portion) 719 are aligned with the inner diameter protrusions 71j (three locations) of the main plate 71 to push the lock ring 719 into the main plate 71, and then the lock ring 7
19 is rotated in the unlocking direction (counterclockwise direction in the drawing) to be bayonet-coupled to the main plate 71. As a result, the lock ring 719 restrains the base plate 71 in the optical axis direction,
It is designed to be rotatable around the optical axis.

Then, the lock ring 719 rotates, and the cutout portion 719c of the lock ring 719 is again projected.
Locking rubber (restricting member) 72 is used as an elastic member in order to prevent the bayonet connection from being disconnected in the same phase as j.
6 is provided on the main plate 71. This allows the lock ring 7
The rotation of the lock member 19 is restricted so that it can rotate only within the drive range (the angle θ ₀ of the notch 719d) controlled by the lock rubber 726.

That is, when the lock rubber 726 is not provided, the lock ring 719 has a wide driving range with respect to the main plate 71. This also connects the bayonet,
The bayonet connection can be released, but the lock rubber 72
6 is provided and the drive range is restricted to the angle θ ₀ , the outer diameter cutout portion 719c cannot rotate to the same phase as the inner diameter protrusion 71j, thereby preventing the bayonet from coming off.

Here, the lock rubber 726 is pressed into a hole (not shown) of the base plate 71 and is planted. The tilting direction of the lock rubber 26 is regulated by enclosing a substantially half circumference of the outer periphery by a rear surface protruding ear 71a of the base plate 71 and a convex portion around the screw hole (self-tapping hole) 71L with respect to the base plate 71. Further, the yoke 727 is screwed to the base plate 71 and the
A lock rubber 726 is sandwiched between the yoke 727 and the second yoke 72 to slightly charge the elasticity of the rubber, as shown in FIG. Thus, the lock rubber 726 is fixed to the base plate 71 without adding a screw or an adhesive.

Next, referring to FIGS. 9 and 10, the lock rubber 72
The contact position relationship between the lock ring 6 and the lock ring 719 and the drive range of the lock ring 719 will be described. 9 and 10
7 is a schematic view in which only essential parts are extracted from the plane part of FIG. 7, and the shape and layout are slightly changed from the actual assembled state for easy understanding.

FIG. 9 is a plan view showing a locked state. In the figure, the lock ring 719 is urged clockwise by a lock spring 728, but the lock rubber 726 is in contact with the side 719i of the lock ring 719 to prevent rotation. The rotation of the lock ring 719 is made elastic because it is made of rubber separate from the main plate 71, so that the lock ring 719 absorbs the shock at the time of locking and does not generate a loud noise. The contact side 719i of the lock rubber 726 is provided near the coil 720. The vicinity of the coil 720 is a portion of the lock ring 719 where the mass is concentrated.
Has the largest inertial force when rotating.

When the hook 719e is stopped from rotating, the lock ring 719 is deformed because it is separated from the coil 720. Due to this deformation, the sound quality at the time of impact at the time of locking is poor,
It becomes uncomfortable and the lock ring 719 is more likely to come off than the main plate 71 (because of the patchon connection). For this reason, in the present invention, the lock ring 719 is elastically detented in the vicinity of the coil 720 and has a buffering function. Is small and the sound quality is improved.

The bayonet connection is stronger than the patchon connection, and since the lock ring 719 is not deformed, the lock ring 719 does not come off from the main plate 71. The lock ring 719 is driven in the locking direction and the unlocking direction, but this driving is restricted, and a sound when the locking ring 719 is stopped is generated in both directions.

However, immediately before the end of driving in the unlocking direction, the armature 724 is first moved to the suction yoke 72.
9 makes contact with a weak force (due to the elastic force of the armature spring 723), at which time a small metallic sound is produced, but thereafter, no sound is generated at the end of driving due to the elasticity of the armature spring 723. Further, since the above-mentioned metal sound is also generated in synchronization with the release operation of the photographer (when the image stabilizing system is turned on), the photographer has little discomfort. As described above, the sound generated when locking is reduced.

In this embodiment, the lock rubber 726 is provided as described above, and the lock ring 719 is provided near the coil 720.
And make contact with it. As described above, in this embodiment, the lock ring 7 having the bias spring in the (A1) locking direction is used.
19 is rotated in the locking direction (clockwise direction) with respect to the main plate 71 (A2), and is then rotated in the unlocking direction (A3) to be bayonet-coupled and locked with a lock rubber.

By capturing the above three configurations,
(B1) The lock ring can be stably connected to the main plate with a simple bayonet retaining structure, and (B2) the noise generated at the time of locking can be suppressed to a small level (B3) Furthermore, the lock rubber is arranged near the coil. This prevents deformation of the lock ring and does not deteriorate the sound quality generated at the time of locking.
And so on.

The lock rubber 726 according to this embodiment is also characterized in that it serves as a stopper when the lock ring 719 is unlocked.

In FIG. 10, the lock ring 719 rotates in the unlock direction and the armature 724 attracts the attraction yoke 729.
It is a schematic diagram at the moment of contact with. At this time, the lock rubber 72
The clearance between the outer periphery of the lock ring 6 and the side 719j of the lock ring is θ ₂ , and the lock ring ear 719a and the armature 724
Is defined as φ (driving allowance for equalizing the armature 724 to the suction yoke 729), θ ₂ <φ.

[0056] That side 719j is not the state condition of FIG. 10 from (driving allowance the used-up state) when until the driving angle of the lock ring 719 and theta ₁ of theta ₁ -.phi in FIG 9 <θ ₀ <θ ₁ Have a relationship.

As a result, even if the lock ring 719 continues to be driven in the unlocking direction in the state of FIG. 10, it is better that the lock rubber 726 elastically abuts the side 719j than the lock ring ear 719a presses the armature 724. Because of the speed, the armature 724 is reliably attracted to the attraction yoke 729.

As described above, the stopper is used to restrict rotation in both directions, and the stopper is formed by one elastic means, and the stopper is fixed only by being sandwiched between the parts of the member, and the stopper is the bayonet removal. Since the stopper is also used, the assembling workability is good, there is no unpleasant sound during operation, a stable mechanism and a locking device (locking device) that reliably operates are obtained.

The mechanical parts of the lens barrel described above are roughly classified into a lens 74, a support frame 75, and coils 76p and 76.
y, IRED 77p, 77y, support balls 79a, 79b, charge spring 710, and support shaft 711 constitute one element of an optical holding means (correction means) for eccentricizing the optical axis, and a main plate 71, a second yoke 72, and a permanent magnet 73. , The first yoke 712 constitutes one element of the supporting means for supporting the correcting means,
18, lock ring 719, coil spring 720, armature shaft 721, armature rubber 722, armature spring 723, armature 724, yoke 727, lock spring 728, suction yoke 729, suction coil 730
Constitutes one element of the locking means for locking the correction means. Armature 724, yoke 729, coil 730
Constitutes one element of the holding unit. Armature shaft 72
1. Armature rubber 722, armature spring 723
Constitutes one element of the equalizing means.

Next, returning to FIG. 1, I on the hard substrate 715
C731p and 731y are position detecting elements 78p and 78, respectively.
This is an IC for amplifying the output of y. FIG. 12 is an explanatory diagram of the internal configuration (ICs 731p and 731y have the same configuration.
Here, only the IC 731p is shown. ).

In the figure, the current-voltage conversion amplifier 73
1ap and 731bp are photocurrents 7 generated by the light projecting element 77p in the position detecting element 78p (comprising resistors R ₁ and R ₂ ).
8 _i1p and 78 _i2p are converted into voltages. Differential amplifier 7
31cp is each current-voltage conversion amplifier 731ap, 731
The difference output of bp is obtained and amplified.

Light emitted from the light projecting elements 77p and 77y enters the position detecting elements 78p and 78y via the slits 75ap and 75ay as described above. When the support frame 75 moves in a plane perpendicular to the optical axis, the position detection elements 78p,
The position of incidence on 78y changes. The position detecting element 78p has sensitivity in the direction of the arrow 78ap, and
ap is a direction orthogonal to the arrow 78ap (78ay direction).
The light beam spreads out in the direction of arrow 78ap, and the light beam is narrowed in the direction of arrow 78ap.

Therefore, only when the support frame 75 moves in the direction of the arrow _713p , the photocurrents 78 _i1p , 7 of the position detecting element 78p are _obtained .
The balance of 8 _i2p changes, and the differential amplifier 731 cp outputs according to the direction of the arrow 713 p of the support frame 75. The position detection element 78y has a detection sensitivity in the direction of the arrow 78ay,
The slit 75ay is in a direction (7
8 ap direction), the support frame 75 has an arrow 7
The position detection element 78y changes the output only when it moves in the 13y direction.

The addition amplifier 731dp obtains the sum of the outputs of the current-voltage conversion amplifiers 731ap and 731bp (total amount of light received by the position detection element 78p), and the drive amplifier 731ap receiving this signal drives the light projecting element 77p accordingly.

Since the light projecting element 76p extremely unstablely changes its light projecting amount due to temperature or the like, the absolute values 78 _i1p +78 _{i2p of the} photocurrents 78 _i1p and 78 _i2p of the position detecting devices 78p and 78y change accordingly. To do. Therefore, the differential amplifier 731c which is 78 _i1p −78 _i2p indicating the position of the support frame 75
The output of p also changes.

Therefore, as described above, the light emitting element 77p is controlled by the drive circuit so that the total amount of received light is constant, so that the output of the differential amplifier 731cp does not change.

The coils 76p and 76y in FIG. 1 are permanent magnets 7.
3. The support frame 75 is located in a closed magnetic path formed by the first yoke 712 and the second yoke 72, and is driven in the direction of an arrow 713p by passing a current through the coil 76p. (Rule) By passing a current through the coil 76y, the support frame 75 is driven in the direction of the arrow 713y.

Generally, the outputs of the position detecting elements 78p and 78y are amplified by the ICs 731p and 731y, and when the coils 76p and 76y are driven by the outputs, the support frame 75 is driven to change the outputs of the position detecting elements 78p and 78y. Become. Here, when the driving direction (polarity) of the coils 76p and 76y is set to a direction in which the outputs of the position detecting elements 78p and 78y become smaller (negative feedback), the outputs of the position detecting elements 78p and 78y are substantially reduced by the driving force of the coils 76p and 76y. The support frame 75 is stabilized at the position where it becomes zero.

In this way, the output from the position detecting elements 78p and 78y is negatively fed back to drive (herein, referred to as a position control method). For example, a target value (for example, a camera shake angle signal) is externally supplied to the ICs 731p and 731y. , The support frame 75 drives extremely faithfully according to the target value.

Actually, the differential amplifiers 731cp and 731c
The output of y is sent to the main substrate (not shown) via the flexible substrate 716, where analog-digital conversion (A / D conversion) is performed and the result is captured by the microcomputer. In the microcomputer, the signal is appropriately compared and amplified with a target value (camera shake angle signal), phase-compensated by a digital filter method (to make position control more stable), and then passed through the flexible substrate 716 again to the IC 732 (the coils 76p and 76).
y drive).

The IC 732 performs PWM (pulse width modulation) driving of the coils 76p and 76y based on the input signal,
The support frame 75 is driven. The support frame 75 is indicated by arrows 713p and 7
It is slidable in the 13y direction, and the position is stabilized by the position control method described above. Incidentally, in a consumer optical device such as a camera, the support frame 75 is always used from the viewpoint of preventing power consumption.
Is not controlled. Since the support frame 75 can freely move around in the plane orthogonal to the optical axis in the non-controlled state, the following measures should be taken against the sound generation and damage of the collision at the stroke end at that time. ing.

As shown in FIGS. 6 to 10, three protrusions 75f radially protruding are provided on the back surface of the support frame 75. As shown in FIG. 7 or 9, the tip of each protrusion 75f has a mechanical lock ring 719. Is fitted to the inner peripheral surface 719g. Thus, the support frame 75 is restrained in all directions with respect to the main plate 71.

FIG. 13 is a timing chart of the mechanical lock ring drive, in which the coil 720 is energized by the arrow 719i (PWM drive shown by 720b) and the attraction magnet 730 is also energized (730a). Therefore, the armature 724 abuts the suction yoke 729, and when the armature 724 is equalized, the armature 724 is sucked by the suction yoke.

Next, when the coil 720 is de-energized at the time indicated by 720c, the lock ring 719 is locked by the lock spring 72.
Attempts to rotate clockwise with the force of 8, but as described above, the rotation is restricted because the armature 724 is adsorbed by the adsorption yoke 729. At this time, the projection 7 of the support frame 75
5f is located at a position facing the cam 719f (the cam 719).
f rotates), the supporting frame is composed of the projection 75f and the cam 71.
It becomes possible to move by the clearance between 9f.

Therefore, the support frame 75 is dropped in the direction of gravity G, but the support frame 75 is also in the control state at the time of the arrow 719i in FIG. 13, and therefore is not dropped. The support frame 75 is restrained by the inner circumference of the lock ring 719 during non-control, but actually has a play corresponding to the fitting play between the projection 75f and the inner peripheral wall 719g. In other words, the support frame 75 falls downward in the direction of gravity by the amount of the play, and the center of the support frame 75 and the center of the main plate 71 are shifted. Therefore, from the time of the arrow 719i, for example, control is performed to spend one second and slowly move to the center of the main plate (the center of the optical axis).

When this is rapidly moved to the center, the lens 7
This is because it is uncomfortable for the photographer to feel the image swaying through 4 and to prevent image deterioration due to the movement of the support frame 75 even if exposure is performed during this time (for example, in 1/8 second). The support frame is moved by 5 μm). Specifically, arrow 719i
The outputs of the position detecting elements 78p and 78y at the time are stored,
The control of the support frame 75 is started with the value as a target value, and then spent for one second, and moves to the target value at the time of the preset optical axis center (75 g). After the lock ring 719 is rotated (unlocked state), the support frame 75 is driven based on the target value from the vibration detection means (overlapping with the above-described movement of the center position of the support frame) to start the image stabilization. become.

If the image stabilization is turned off at the time of arrow 719j to end the image stabilization here, the target value from the vibration detecting means is not input to this apparatus, and the support frame 75 is controlled to the center position and stops. At this time, the power supply to the suction coil 730 is stopped (730b). Then, the suction force of the armature 724 of the suction yoke 729 is lost, and the lock ring 719 is rotated clockwise by the lock spring 728 to return to the state of FIG. At this time, the lock ring 719 becomes the stopper pin 7
The rotation is regulated by abutting against 26. After that (eg 20ms
After ec) The control of the present device is cut off, and the timing chart of FIG. 13 ends.

FIG. 14 is a block diagram showing the outline of the image stabilization system. In FIG. 14, reference numeral 91 is a vibration detection means, which is composed of a shake detection sensor for detecting an angular velocity of a vibration gyro and the like, and a sensor output calculation means for cutting the DC component of the shake detection sensor output and then integrating it to obtain an angular displacement. It

The angular displacement signal from the vibration detecting means 91 is input to the target value setting means 92. This target value setting means 9
2 is a variable differential amplifier 92a and a sample hold circuit 92
Since the sample-hold circuit 92b is always sampling, the two signals input to the variable differential amplifier 92a are always equal and the output is zero. However, when the sample-and-hold circuit 92b is put into a hold state by an output from a delay unit 93, which will be described later, the variable differential amplifier 92a starts outputting continuously with the time being zero.

The amplification factor of the movable differential amplifier 92a is variable by the output of the image stabilization sensitivity setting means 94. The reason is that the target value signal of the target value setting means 92 is a target value (command signal) for causing the correction means to follow, but the correction amount of the image plane (the image stabilization sensitivity) with respect to the driving amount of the correction means is zoom and focus. This is to compensate for the change in the image stabilization sensitivity because it changes depending on the optical characteristics based on the change in focus. Therefore, the image stabilization sensitivity setting unit 94 receives the zoom (focal length) information from the zoom information output unit 95 and the focus (distance) information based on the distance measurement information of the exposure preparation unit 96, and the image stabilization based on the information. The sensitivity is calculated or the image stabilization sensitivity information preset based on the information is extracted to change the amplification factor of the variable differential amplifier 92a of the target value setting means 92.

The correction driving means 97 is ICs 731p, 731y732 mounted on the hard board 715, and the target value from the target value setting means 92 is input as a command signal. The correction starting means 98 is provided for the IC 7 on the hard board 715.
32 is a switch that controls the connection between the coil 32 and the coils 76p and 76y. Normally, by connecting the switch 98a to the terminal 98c, both ends of the coils 76p and 76y are short-circuited, and the signal of the logical product means 99 is output. Is input, the switch 98a is connected to the terminal 98b, and the correction unit 910 is in the control state (the shake correction is not performed yet, but the coils 76p,
Power is supplied to 76y, and the correcting means 910 is stabilized at a position where the signals of the position detecting elements 78p and 78y become substantially zero.)

At the same time, the output signal of the logical product means 99 is also input to the locking means 914, which causes the locking means to unlock the correction means 910. The correction means 910 inputs the position signals of the position detecting elements 78p and 78y to the correction driving means 97, and performs the position control as described above. When both signals of the release half-press SW1 signal of the release means 911 and the output signal of the image stabilization switching means 912 are input to the logical product means 99, the AND gate 99a as a component thereof outputs a signal. That is, the anti-shake switching means 9
When the photographer operates the image stabilization switch 12 and presses the release halfway with the release means 911, the correction means 91
0 is unlocked and enters the control state.

The SW1 signal of the release means 911 is input to the exposure preparation means 96, which performs photometry, distance measurement, and lens focusing drive, and outputs focus information to the image stabilization sensitivity setting means 94 as described above. The delay unit 93 receives the output signal of the AND unit 99 and outputs it one second later, for example, and causes the target value setting unit 92 to output the target value signal as described above.

Although not shown, the vibration detecting means 91 also starts to operate in synchronization with the SW1 signal of the release means 911. As described above, a sensor output calculation including a large time constant circuit such as an integrator requires a certain period of time from startup to a stable output. The delay means 93 is the vibration detection means 9
After waiting until the output of the first signal is stabilized, the correcting means 910
The vibration detection means 91 plays the role of outputting a target value signal to the
The image stabilization is started after the output of is stabilized.

The exposure means 913 performs the mirror-up by the release push-off SW2 signal input of the release means 911, opens and closes the shutter at the shutter speed obtained based on the photometric value of the exposure preparation means 96 to perform the exposure, and the mirror-down. Then, the shooting ends. After the photographing is completed, when the photographer releases his hand from the release unit 911 and turns off the SW1 signal, the AND unit 99 stops the output, and the sample and hold circuit 92b of the target value setting unit 92 enters a sampling state.
The output of the variable differential amplifier 92a becomes zero. Therefore, the correction means 910 returns to the control state in which the correction driving is stopped.

Since the output of the logical product means 99 is turned off, the locking means 914 locks the correction means 910, and then the switch 98a of the correction starting means 98 is connected to the terminal 98c, and the correction means 910 is controlled. It will not be done. The vibration detecting means 91 is operated by a timer (not shown).
The operation continues for a certain period of time (for example, 5 seconds) after the operation 1 is stopped, and then stops. This is because the photographer frequently performs the release operation after stopping the release operation, and in such a case, it is possible to prevent the vibration detection unit 91 from being activated every time, and to shorten the standby time until the output is stabilized. When the vibration detecting means 91 has already been started, the vibration detecting means 91 sends a started signal to the delay means 93 to shorten the delay time.

As described above, in this embodiment, the locking portion (lock ring 719) of the locking means is bayonet-coupled with the ground plate 71 of the ground plate portion (supporting means), and the locking portion (lock ring 719) is locked. Direction (locking direction), insert into the main plate 71, rotate in the unlocking direction (unlocking direction) to perform bayonet coupling, and elastic means (lock rubber 726).
As a result, the bayonet is prevented from coming off, so that the assembling property is good, and a stable locking device with small operation noise is obtained.

Further, when the mass of the locking portion (lock ring 719) is concentrated (electromagnetic driving means for driving the locking portion: coil 720) is received by the restricting member (lock rubber 726), it is generated during operation. A stable locking device is obtained by preventing deterioration of sound quality and deformation of the locking portion (lock ring 719) during operation. In addition, since the limiting means (lock rubber 726) is fixed by being sandwiched between the fixing part (support means: second yoke 72) and the electromagnetic driving means (yoke 727) for driving the locking part, the assembling workability is improved. I have a good locking device.

Further, by restricting the driving range of the locking portion (lock ring 719) in both the locking direction (locking direction) and the non-locking direction (unlocking direction), a reliable locking and unlocking operation is performed. In particular, the holding portion (the armature 724 (iron piece), the attraction yoke 729 (electromagnet), the attraction coil 730, which holds the locking portion (lock ring 719) in the unlocked state (unlocked state) can be realized. (Equipment) to reduce the drive allowance of the locking portion (lock ring 719) for operating the equalizing means (armature shaft 721, armature rubber 722, armature spring 723) for adjusting the contact positions of the iron piece and the electromagnet. A good locking device is obtained by elastically restricting the drive range of the locking portion in the direction by the elastic portion (lock rubber 726).

An optical image including the above-mentioned lens barrel is used to form an object image (image) on a predetermined surface (photosensitive surface).

Next, another embodiment of the light-shielding mask of the present invention will be described. FIG. 21 is a cross-sectional view of the essential parts of Embodiment 2 of the light-shielding mask of the present invention. In this embodiment, the mask 717
Instead of adhering the hard substrate 715 with a double-sided tape, the press-fitting portion 31 provided on the mask 717 is fixed to the electronic component 732 by press-fitting.

Generally, since the hard substrate 715 is a flat plate of glass epoxy having no unevenness, if press-fitting and fixing are performed, the outer diameter of the hard substrate 715 is made to be wrapped by the mask 717 and the outer peripheral portion of the hard substrate and the flange portion of the mask 717 are formed. Will be press-fitted or patched. In this case, the outer diameter of the mask 717 needs to be larger than the outer diameter of the hard substrate 715, resulting in an increase in size.

Therefore, in this embodiment, the mask 717 is fixed by using the IC mounted on the hard substrate 715.

FIG. 21 corresponds to the sectional view taken along the line AA of FIG. A rib 31 as a press-fitting portion shown in FIG. 21 is provided around the frames 11 and 12 of FIG.
Of the hard substrate 71 by pressing the mask 717 into the IC package after forming it into a size that allows press fitting with respect to the shape of
It is fixed at 7.

Since the rib 31 is thin, there is no sink mark on the appearance. Also, because it is press-fitted and fixed, there is an advantage that it is not necessary to use double-sided tape.

Next, a third embodiment of the light-shielding mask of the present invention will be described. In the second embodiment, the mask 717 is fixed to the hard substrate 715 by using the IC on the hard substrate 715 (for example, IC732 and 733 in FIG. 1). However, without using the circuit mounted on the hard substrate 715, a dummy IC package is used as a bonding member for the hard substrate 715.
The mask 717 may be mounted on the above and used to fix the mask 717.

In FIG. 22, reference numeral 41 denotes a resin block (joint member) in which terminals 41a are integrally formed with inserts, and the terminals 41a are soldered to the terminals on the hard board 715 by solder 42. 13 is provided, where it adheres to the mask 717. Therefore, the mask 717 is fixed to the hard substrate 715, but since the mask 717 does not have the ribs as in Embodiments 1 and 2, the appearance does not have a sink mark. Further, since the adhesive area of the resin block 41 can be set more freely than in the case of using the IC of the second embodiment, the mask 717 can be reliably fixed by utilizing the vacant space on the hard substrate.

The dummy IC package may be formed by bending the metal plate having the terminal 41a instead of integrally molding the resin block 41 and the terminal 41a.

FIG. 23 is a fourth embodiment of the light-shielding mask of the present invention.
FIG. In this embodiment, a plurality of metal pins 51 are integrally formed on the back surface of the mask 717. Then, the pin 51 penetrates the hard substrate 715 and the solder 42
It is fixed with solder. With such a structure, the mask 717 is securely fixed to the hard substrate 715. Further, the connecting portion 52 of the pin 51 with the mask 717 is also formed into a rib shape or a column shape so that a sink mark does not stand out on the appearance. With the above configuration, the hard substrate is more firmly fixed to the mask 717 without using the double-sided tape.

[0100]

According to the present invention, by setting each element as described above, the lens barrel can be efficiently and easily housed and installed in a narrow space, and at the same time there is no discomfort in appearance. It is possible to achieve a light-shielding mask that blocks unnecessary light in a light beam that enters the lens barrel from the outside and a lens barrel that uses the light-shielding mask.

Further, according to the present invention, (C1) the light shielding mask is fixed to a part of the lens barrel at the apexes of a plurality of ribs having a uniform thickness and a substantially uniform thickness. It is possible to suppress the molding sink mark and to fix it securely, and it is possible to obtain a light-shielding mask that is thinner than the conventional screw-fastening method.

(C2) By providing the ribs in concentric circles centering on the optical axis (center of the light-shielding mask), sink marks can be made inconspicuous. Further, by providing a light-shielding groove having the same phase as an integral multiple of the rib on the external appearance, the sink mark can be prevented from being apparent on the external appearance.

(C3) Further, by providing the mask with a groove portion that complements the shape of the adjacent IC, the light-shielding mask can be compactly attached to the IC and the substrate on which the IC is mounted.

(C4) Since the IC mounted on the substrate is used for mounting the light-shielding mask, the light-shielding mask can be press-fitted into the IC so that the light-shielding mask can be fixed easily and compactly without using adhesive. Can be done.

(C5) The light-shielding mask can be securely and easily fixed to the substrate by integrally forming the metal pin on a part of the light-shielding mask and soldering and fixing the metal pin to the substrate.

(C6) By mounting the bonding member on the substrate and fixing the light shielding mask to the bonding member, the light shielding mask can be compactly attached to the substrate without forming a molding sink on the appearance of the light shielding mask. . And the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a part of FIG. 1;

FIG. 3 is an explanatory view of a part of FIG. 2;

FIG. 4 is a plan view of an essential part when viewed from a direction of an arrow 79c in FIG. 3;

FIG. 5 is a perspective view of a main part of a part of FIG. 1;

FIG. 6 is a perspective view of a main part of a part of FIG. 1;

FIG. 7 is a plan view of a main part of a part of FIG. 1;

FIG. 8 is a perspective view of a main part of a part of FIG. 1;

FIG. 9 is a plan view of a main part of a part of FIG. 1;

FIG. 10 is a plan view of a main part of a part of FIG. 1;

FIG. 11 is a sectional view of a main part of a part of FIG. 1;

FIG. 12 is an explanatory diagram of the first embodiment of the present invention.

FIG. 13 is an explanatory diagram of the first embodiment of the present invention.

FIG. 14 is a main block diagram of Embodiment 1 of the present invention.

FIG. 15 is a sectional view of an essential part of Embodiment 1 of the lens barrel of the present invention.

FIG. 16 is a schematic view of a main part of Embodiment 1 of the light-shielding mask of the present invention.

FIG. 17 is a schematic view of a main part of a part of the light-shielding mask of the present invention.

18 is an enlarged perspective view of a part of FIG.

FIG. 19 is a schematic view of a main part of a first embodiment of a light-shielding mask of the present invention.

FIG. 20 is a schematic view of a main part of a part of the first embodiment of the light-shielding mask of the present invention.

FIG. 21 is a schematic view of a main part of a second embodiment of the light-shielding mask of the present invention.

FIG. 22 is a schematic diagram of a main part of a third embodiment of the light-shielding mask of the present invention.

FIG. 23 is a schematic view of a main part of a fourth embodiment of the light-shielding mask of the present invention.

[Explanation of symbols]

 71 Base plate (supporting means) 72 Second yoke 73, 718 Permanent magnet 712 First yoke 719 Lock ring (locking part) 727 Yoke 75 Supporting frame (optical holding means) 726 Elastic means (restricting member) 715 Hard substrate 717 Light-shielding mask 717f Light-shielding groove 717a, 21a, 31 Rib 11, 12 Frame (IC complementary groove) 13 Double-sided tape 51 Metal pin 732 Electronic component (IC)

Claims (9)

[Claims] 1. A light-shielding mask, which is provided in a part of a housing for accommodating an optical member, for shielding unnecessary light of a light flux entering the housing from the outside, and the light-shielding mask is a molding thereof. A light-shielding mask having a thickness substantially equal to that of the wall and having a plurality of convex ribs for fixing to a member housed in the housing. 2. The light-shielding mask according to claim 1, wherein the plurality of ribs are provided in a partial area on a concentric circle centered on the central axis of the housing on a flat plate. 3. A light-shielding mask, which is provided in a part of a housing for accommodating an optical member, for shielding unnecessary light of a light flux entering from the outside into the housing, the light-shielding mask comprising: The light incident side surface has a plurality of light shielding grooves concentric with the central axis of the housing, and the light incident side surface has a circle in phase with the light shielding groove for fixing to a member housed in the housing. A light-shielding mask having a plurality of arc-shaped and convex ribs. 4. A light-shielding mask, which is provided in a part of a housing for accommodating an optical member, for shielding unnecessary light of a light beam entering the housing from the outside, wherein the light-shielding mask is the housing. A light-shielding mask comprising: a plurality of ribs for fixing electronic components housed in the body to a part of a substrate on which the electronic components are mounted; and a groove for complementing the shape of the electronic components on the substrate. 5. A light-shielding mask, which is provided in a part of a housing for accommodating an optical member, for shielding unnecessary light of a light flux entering the housing from the outside, wherein the light-shielding mask is the housing. A light-shielding mask having a press-fitting portion for press-fitting an electronic component housed in a body on which the electronic component is mounted. 6. A light-shielding mask, which is provided in a part of a housing for accommodating an optical member, for shielding unnecessary light of a light flux entering the housing from the outside, the light-shielding mask being the housing. A light-shielding mask having metal pins for soldering and fixing it to a part of a substrate housed in the body. 7. A light-shielding mask, which is provided in a part of a housing for accommodating an optical member, for shielding unnecessary light of a light flux entering the housing from the outside, the light-shielding mask being adjacent to the light-shielding mask. A light-shielding mask having a fixing portion for fixing to a joining member mounted on a substrate. 8. A lens barrel, wherein the light-shielding mask according to claim 1 is provided in a housing that houses an optical member. 9. The light-shielding mask according to claim 1, wherein an image is formed on a predetermined surface by using a lens barrel provided in a housing accommodating an optical member. And optical equipment.