JPH07168235A - Driving mechanism for optical axis correcting lens - Google Patents

Abstract

PURPOSE:To precisely detect the position of an optical axis correcting lens in a driving mechanism for the optical axis correcting lens suitable for optical system equipment requiring the correction of a camera shake. CONSTITUTION:Position sensors 16h and 16v detecting positional components obtained by dividing the position of a correcting convex lens 3 into the components of two directions (H-V direction) orthogonally crossed each other in a radial direction centering the optical axis X' of the correcting convex lens 3 respectively are provided and composed of light emitting diodes (LEDs) 17h and 17v and semiconductor position detecting elements (PSDs) 18h and 18v receiving the light of the LEDs and the LEDs and PSDs are attached to the lens holder 6 of the correcting convex lens and the lens barrel of a photographic lens system 2 respectively. Each of the PSDs is formed unidirectionally longer and arranged so that the longitudinal direction of the PSD and the radial direction centering the optical axis X of the photographic lens system almost coincide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel optical axis correcting lens driving mechanism. Specifically, for example, regarding a drive mechanism of an optical axis correction lens suitable for an optical system device such as a handy type video camera device or a telescope that requires so-called camera shake correction in a use state, the position of the optical axis correction lens The present invention aims to provide a novel optical axis correction lens drive mechanism capable of accurately detecting light.

[0002]

2. Description of the Related Art For example, in a handy type video camera device, as a method for correcting the camera shake, an afocal lens composed of a convex lens and a concave lens is arranged in front of a taking lens system as an optical axis correcting lens, and these convex lenses are used. And / or a method of correcting a camera shake by moving a concave lens in a direction orthogonal to the optical axis is known.

In such a system, the position of the optical axis correcting lens must be detected, and as a means therefor, the position of the optical axis correcting lens is orthogonal to two directions, for example, HV.
Direction (H direction is horizontal and V direction is vertical)
It is conceivable that the position of the optical axis correcting lens in each direction is detected separately by two position sensors.

FIGS. 6 to 8 explain a method of correcting a camera shake by moving an afocal lens composed of a convex lens and a concave lens as an optical axis correcting lens, and moving the convex lens of these lenses in a direction orthogonal to the optical axis. FIG.

Incidentally, "h" added to the reference numeral of each member described later.
Alternatively, as for the subscript of “v”, “h” indicates that in the horizontal direction, and “v” indicates that in the vertical direction.

Reference numeral a denotes a taking lens system, and an image pickup device (CCD) b is arranged behind it.

Reference numeral c denotes a correcting convex lens located on the side of the taking lens system a of the optical axis correcting lens composed of an afocal lens, and the correcting convex lens c is close to the front of the taking lens system a. Are arranged via suspensions d and d, and the optical axis x ′ thereof is always parallel to the main optical axis x of the photographing lens system a.

Reference numerals eh and ev are linear motors for driving the correcting convex lens c. And the moving coils hh and hv attached to the correcting convex lens c side. One (for V direction) linear motor ev is located at a position near the upper end of the correcting convex lens c and the other (for H direction). The linear motors eh) are arranged at positions near the right end of the correcting convex lens c (see FIG. 7).

Numerals ih and iv are position sensors for detecting the position of the correcting convex lens c. For example, the issuing diodes (LED) jh and jv and the semiconductor position detecting element (PS).
D) kh, kv, etc., and the light receiving surface of each of PSD kh, kv is formed in a rectangular shape whose one side is long.

The LEDs jh and jv are peripheral edge portions of the correcting convex lens c and are located at positions 90 ° apart from each other at the central angles on the opposite sides from the positions where the linear motors eh and ev are arranged, that is, the vertical linear motors. ev and a position facing each other across the optical axis x and the horizontal linear motor eh and the optical axis x
It is attached to each of the positions facing each other across.

The PSD kh, kv are supported by a lens barrel (not shown) at positions respectively facing the LEDs jh, jv, and their longitudinal directions are the correction convex lenses c.
It is designed to extend in the same direction as the tangential direction of.

The vertical component of the correcting convex lens c is detected by the position sensor iv arranged at a position facing the horizontal linear motor eh with the optical axis x interposed therebetween. Is a vertical linear motor ev
Is detected by a position sensor ih disposed at a position facing the optical axis x.

Reference numerals lh and lv (only those for the V direction component are shown in FIG. 6) are camera shake detection sensors composed of angular velocity sensors. When camera shake is detected, a shake detection signal is output, and the shake detection signal is the angular velocity data. Therefore, this is integrated by the camera shake amount calculation circuits mh and mv to detect the change amount of the angle.

The angle data detected by the camera shake amount calculation circuits mh and mv are the optical axis correction lens position control circuits nh and n.
At v, it is compared with the position data of the optical axis correcting lens c obtained by the position sensor ih or iv, the amount of angle to be corrected is detected, and this correction data is output to the linear motor eh or ev. The optical axis correcting lens c is moved vertically or horizontally to correct the optical axis.

[0015]

However, in the camera shake correction system using such a system, the correction convex lens c moves not only in the HV direction but also when the correction convex lens c rotates around its optical axis x '. A so-called rolling that rotates in a certain direction may occur (see FIG. 8).

When the correcting convex lens c rolls, the position sensors ih and iv have their PSDk.
Since h and kv are arranged so as to extend in the tangential direction of the correcting convex lens c, the LEDs jh and jv are PSDkh,
Since it has moved relatively in the substantially longitudinal direction of kv, there is a problem that it is erroneously detected that the correction convex lens c has moved in the H direction and the V direction, respectively.

[0017]

Therefore, in order to solve the above-mentioned problems, the drive mechanism of the optical axis correcting lens of the present invention is configured so that the lengthwise direction of each light receiving element formed in one direction and the main lens system. The light receiving element is arranged so that the radiation direction around the optical axis substantially coincides.

Further, in another optical axis correcting lens driving mechanism of the present invention, the longitudinal direction of each light receiving element formed long in one direction and the radial direction about the optical axis of the optical axis correcting lens are substantially the same. The light receiving elements are arranged so as to coincide with each other.

[0019]

Therefore, according to the drive mechanism of the optical axis correcting lens of the present invention, the longitudinal direction of the light receiving element and the emission direction about the optical axis of the optical axis correcting lens or the main lens system are substantially aligned with each other. Since the light receiving element is arranged, when the optical axis correcting lens rolls, its moving direction becomes a direction substantially orthogonal to the longitudinal direction of the light receiving element, and it is not possible to erroneously detect that the optical axis correcting lens has moved in its radial direction. Therefore, the position of the optical axis correcting lens can be accurately detected.

[0020]

The details of the drive mechanism of the optical axis correcting lens of the present invention will be described below according to each embodiment applied to a video camera device.

1 to 3 show a first embodiment of a drive mechanism for an optical axis correcting lens according to the present invention.

Incidentally, "h" added to the reference numeral of each member described later.
Alternatively, the subscript of “v” indicates that “h” is related to the horizontal (H) direction and “v” is related to the vertical (V) direction.

In the figure, reference numeral 1 is a drive mechanism for the optical axis correcting lens, and of the optical axis correcting lenses constituted by afocal lenses, a correcting convex lens 3 located on the side of the photographing lens system 2 and the correcting convex lens. The suspensions 4 and 4 and the correction convex lens 3 that support the optical axis X ′ of the taking lens system 2 so that the optical axis X ′ can be moved while keeping the optical axis X ′ parallel to the main optical axis X of the taking lens system 2.
It has drive means 5h, 5v, etc. for moving to a predetermined position.

The correcting convex lens 3 is supported by the lens holder 6 and positioned in front of the taking lens system 2, and its optical axis X'is positioned so as to be parallel to the main optical axis X of the taking lens system 2. It

The lens holder 6 has a substantially ring shape, and coil bobbins 7h and 7v are provided at the upper and right ends thereof.
Is integrally projecting outward, and mounting pieces 8h and 8v for mounting LEDs of a position sensor, which will be described later, are integrally projecting outwardly at the lower end portion and the left end portion thereof.

Thus, by forming the coil bobbins 7h, 7v and the mounting pieces 8h, 8v on the peripheral edge of the lens holder 6 at substantially equal intervals in the circumferential direction, the correction convex lens 3 holding the center of gravity of the lens holder 6 therein. It can be aligned with the optical axis, and the overall balance can be improved.

The coil bobbin 7 is composed of two bobbin pieces 7a, 7a which are parallel to each other, and the two bobbin pieces 7a and 7a.
The center of the space between and corresponds to the radial direction centered on the axis of the lens holder 6.

The suspension 4 is arranged between two vertical spring pieces 9 and 9 which are long and horizontal in the front-rear direction and which are vertically spaced from each other, and a front end portion of one side edge of each vertical spring piece 9 and 9. A vertical support piece 10 connected to each other and a vertical support piece 11 connecting between the rear end portions of the respective vertical spring pieces 9 on the side opposite to the support piece 10; Vertically long rectangular holes 10a and 11a are formed at positions close to the vertical spring pieces 9 and 9 of the supported piece 11, respectively. As a result, the vertical spring pieces 9 of the support piece 10 and the supported piece 11 are formed.
Narrow horizontal spring pieces 12, 12, ... Are formed at a position closer to 9 and in a direction perpendicular to the upper and lower edges thereof.

The suspension 4 is formed by punching and bending a sheet metal material having a predetermined size.

In the suspensions 4 and 4 thus formed, the supported pieces 11 and 11 are oriented perpendicular to the left and right side surfaces of the lens barrel (not shown) of the photographic lens system 2. In addition, the support pieces 10 and 10 are fixed with screws or the like in a state in which the support pieces 10 and 10 project forward from the taking lens system 2.

The left and right ends of the lens holder 6 are in a predetermined direction between the tips of the support pieces 10 and 10 of the suspensions 4 and 4 (the coil bobbin 7 at the upper end extends upward and the mounting piece 8 at the lower end extends downward). ) With screws etc.,
Also, the spring pieces 9, 9, ... Of the suspensions 4, 4.
, 12, 12, ... Are not bent, and the optical axis X ′ of the correcting convex lens 3 is the main optical axis X of the taking lens system 2.
To match.

The driving means 5 includes a coil 13 wound around the bobbin pieces 7a of the coil bobbin 7 of the lens holder 6 and a yoke 14 having an E-shaped cross section fixed to the body side (not shown).
And magnets 15 and 15 attached to the yoke 14.

The yoke 14 has a middle piece 14a which is sufficiently smaller than the space between the bobbin pieces 7a of the coil bobbin 7 and 7a, and the middle piece 14a.
a is arranged at a position to be inserted from the outside into the space between the bobbin pieces 7a and 7a, and the pieces 14b, 14 at both ends thereof are arranged.
The magnets 15 and 15 are attached to b.

By supplying power to the coil 13, the lens holder 6 is moved in the radial direction.

Further, the driving means 5h and 5v are arranged at the upper end portion and the right end portion of the lens holder 6, respectively, whereby the driving means 5v arranged at the upper end portion.
Driving the correcting convex lens 3 in the vertical direction, and driving the driving means 5h arranged at the right end can move the correcting convex lens 3 in the horizontal direction.

Reference numerals 16h and 16v denote position sensors, which are composed of LEDs 17h and 17v attached to the lens holder 6 and PSDs 18h and 18v attached to a main body (not shown).

The LEDs 17h and 17v are mounting pieces 8h and 8v formed at the lower end and the left end of the lens holder 6, respectively.
The light emitting side is attached to the taking lens system 2 side.

The PSDs 18h and 18v are in the form of elongated rectangular plates, the longitudinal direction of which coincides with the radiation direction centering on the optical axis X of the photographic lens system 2, and the light-receiving surface of which is the LED 17h. , 17v.

Reference numerals 19h and 19v (only 19v is shown in FIG. 2) are camera shake detection sensors composed of angular velocity sensors. When camera shake is detected, a shake detection signal is output. Since the shake detection signal is angular velocity data, this is detected. The camera shake amount calculation circuits 20h and 20v (only 20v is shown in FIG. 2) are integrated to detect a change in angle.

The angle data detected by the camera shake amount calculation circuits 20h and 20v is used as the optical axis correction lens position control circuit 21.
h, 21v (only 21v is shown in FIG. 2) is compared with the position data of the correction convex lens 3 obtained by the position sensor 16h or 16v, the amount of angle to be corrected is detected, and this correction data is Drive means 5h or 5v
Is output to the correction convex lens 3 in the vertical or horizontal direction to correct the optical axis.

When a camera shake occurs, the camera shake detection sensors 19h and 19v detect the camera shake, and the obtained angular velocity data is calculated by the camera shake amount calculation circuits 20h and 20v as a change amount of the angle.

On the other hand, the position data of the correcting convex lens 3 obtained by the position sensors 16h and 16v and the above angle data are compared by the optical axis correcting lens position control circuits 21h and 21v, and the amount of angle to be corrected is determined. The calculated driving current is supplied to the coils 13h and 13v of the driving means 5h and 5v.

Then, for example, when power is supplied to the coil 13v of the vertical driving means 5v, the correcting convex lens 3 is moved in the vertical direction, and the vertical spring pieces 9, 9, ... Of the suspensions 4, 4.・ Bends and the relative positional relationship between the LED 17v of the vertical position sensor 16v and the PSD 18v is deviated, and the position closed-loop servo control is performed so that this position data becomes a target value.

Also, the position of the correcting convex lens 3 in the horizontal direction is subjected to the closed loop servo control similarly to the position in the vertical direction. At this time, the suspensions 4 and 4 have their horizontal spring pieces 12, 12 ,. It will bend.

When the camera shake has vertical and horizontal components, the two position closed-loop servo controls work, and the suspensions 4 and 4 are flexed simultaneously in the vertical and horizontal directions.

When the correction convex lens 3 rolls, the position sensors 16h and 16v have PSDs 18h and 1v.
Since the 8v is arranged so that its longitudinal direction coincides with the radiation direction of the photographing lens system 2, the LEDs 17h and 17v are set to P
Since it only moves in a direction substantially orthogonal to the SDs 18h and 18v, and does not move in the longitudinal direction of the PSDs 18h and 18v, this state is not mistaken as the movement of the correction convex lens 3 in the radial direction ( (See FIG. 3).

FIGS. 4 and 5 show a second embodiment of the driving mechanism for the optical axis correcting lens of the present invention.

The optical axis correction lens drive mechanism 1A in the second embodiment differs from the optical axis correction lens drive mechanism 1 in the first embodiment only in the position where each position sensor is arranged. Is. Therefore, only the different parts will be described, and the same parts as those in the first embodiment will be denoted by the same reference signs as those of the first embodiment, and the description thereof will be omitted.

Reference numeral 22 denotes a lens holder, and a coil bobbin 23 is provided at an upper end portion and a right end portion of the lens holder 22.
h and 23v are integrally provided so as to project outward, and the coil bobbin 23 includes two bobbin pieces 23 parallel to each other.
a and 23a, the two bobbin pieces 23a and 23a
The center of the space between and corresponds to the radial direction centered on the axis of the lens holder 22.

Reference numeral 24 is a U-shaped mounting piece having an opening at the front, and both ends of the opening end side are the bobbin pieces 23a.
23a is integrally attached to a position near the base end of the rear side edge of 23a, and an LED is attached to the rear end piece as will be described later. Such an attaching piece 24 includes coil bobbins 23h and 23v. It is provided in each.

Numerals 25 and 25 are balancers provided at the positions respectively opposed to the coil bobbins 23h and 23v of the lens holder 22 with the optical axis interposed therebetween.
The center of gravity of the lens holder 22 can be matched with the optical axis of the correction convex lens 3 held therein, and the overall balance can be improved.

Further, the balancers 25, 25 are formed in a rectangular parallelepiped, and are arranged so that the longitudinal direction thereof extends in the direction substantially the same as the tangential direction of the lens holder 22. As a result, the balancer 25, 25 extends outwardly of the lens holder 22. The protrusion can be reduced, which contributes to downsizing.

Reference numerals 26h and 26v denote position sensors, which are composed of LEDs 27h and 27v attached to the attachment pieces 24h and 24v of the lens holder 22 and PSDs 28h and 28v attached to the main body side (not shown).

The LEDs 27h and 27v are the above-mentioned mounting pieces 24.
The light emitting side is attached to h and 24v with the light emitting side facing the taking lens system 2 side.

The PSDs 28h and 28v are in the form of elongated rectangular plates, the longitudinal direction of which coincides with the emission direction of the photographic lens system 2 about the optical axis X, and the light-receiving surface thereof is the LED 27h. It is arranged so as to face 27v.

However, even in such an optical axis correcting lens driving mechanism 1A, when a camera shake occurs, as in the case of the optical axis correcting lens driving mechanism 1 in the first embodiment, a vertical direction is generated. And / or drive means 5 in the horizontal direction
h and / or 5v and position sensor 26h and / or 26v
Position closed loop servo control is performed by and, and the optical axis is corrected.

When the correcting convex lens 3 rolls, the PSDs 28h, 2 of the position sensors 26h, 26v,
8v is arranged such that its longitudinal direction coincides with the radiation direction of the correcting convex lens 3, so that the LEDs 27h, 27
Since v only moves in a direction substantially orthogonal to the PSDs 28h and 28v and does not move in the longitudinal direction of the PSDs 28h and 28v, this state may not be mistaken as a movement of the correction convex lens 3 in the radial direction. No (see Figure 5).

[0058]

As is apparent from the above description, the drive mechanism of the optical axis correcting lens of the present invention comprises an optical axis correcting lens arranged in front of the main lens system and the optical axis correcting lens. A suspension that is eccentrically supported in a substantially plane orthogonal to the optical axis, a driving unit that moves the optical axis correcting lens to a predetermined position, and a position of the optical axis correcting lens with respect to the optical axis. A position sensor is provided which detects as a center a position component which is divided into two components which are orthogonal to each other in the radial direction. Part is attached to the optical axis correcting lens side, and the light receiving element is attached to the main lens system side, and the light receiving element is formed to be long in one direction. Radiation around the optical axis of Direction Metropolitan characterized by being arranged to substantially coincide.

Another drive mechanism for an optical axis correcting lens according to the present invention comprises an optical axis correcting lens arranged in front of the main lens system and an optical axis correcting lens which is substantially orthogonal to the optical axis. A suspension that is supported eccentrically in a plane, a drive unit that moves the optical axis correcting lens to a predetermined position, and a position of the optical axis correcting lens that is orthogonal to each other in the radial direction about the optical axis. A position sensor that detects each as a position component divided into directional components, the position sensor including a light emitting portion and a light receiving element that receives the light of the light emitting portion, the light emitting portion on the main lens system side, , The light receiving element is attached to the optical axis correcting lens side, and the light receiving element is formed to be long in one direction, and each light receiving element is centered on its longitudinal direction and the optical axis of the optical axis correcting lens. Arrange so that the radial direction is almost the same. Characterized in that it was.

Therefore, according to the driving mechanism of the optical axis correcting lens of the present invention, the longitudinal direction of the light receiving element and the radiation direction centering on the optical axis of the optical axis correcting lens or the main lens system are substantially aligned. Since the light receiving element is arranged, when the optical axis correcting lens rolls, its moving direction becomes a direction substantially orthogonal to the longitudinal direction of the light receiving element, and it is not possible to erroneously detect that the optical axis correcting lens has moved in its radial direction. Therefore, the position of the optical axis correcting lens can be accurately detected.

In each of the above embodiments, the driving direction of each driving means is made to coincide with the detection direction of the position component of the optical axis correcting lens by each position sensor. However, in the optical axis correcting lens of the present invention, The drive mechanism is not limited to this, and these directions may be different. In such a case, the position data detected by the position sensor may be divided into drive direction components by the arithmetic circuit to perform position closed loop servo control. Good.

In each of the above embodiments, the light emitting portion is attached to the optical axis correcting lens side, and the light receiving element is attached to the main lens system side. However, in the optical axis correcting lens of the present invention, The drive mechanism is not limited to this, and the light receiving element may be attached to the optical axis correcting lens side and the light emitting portion may be attached to the main lens system side.

Furthermore, in each of the above-mentioned embodiments, the present invention is applied to the video camera device, but the drive mechanism of the optical axis correcting lens of the present invention is not limited to this, and camera shake correction of a telescope, a laser pointer, or the like. It can be applied to optical instruments that must

In addition, the structures and shapes of the respective parts shown in the above embodiments are merely examples of the embodiment when the present invention is carried out, and the technical scope of the present invention is limited by these. Should not be interpreted as.

[Brief description of drawings]

1 shows a first embodiment of a drive mechanism for an optical axis correcting lens according to the present invention together with FIG. 2 and FIG. 3, which is an exploded perspective view.

FIG. 2 is a schematic view showing the overall configuration as viewed from the side.

FIG. 3 is a schematic diagram for explaining the positional relationship between the light emitting unit and the light receiving element when the optical axis correcting lens is rolling.

FIG. 4 shows a second embodiment of the driving mechanism of the optical axis correcting lens of the present invention together with FIG. 5, and this drawing is an exploded perspective view.

FIG. 5 is a schematic diagram for explaining the positional relationship between the light emitting unit and the light receiving element when the optical axis correcting lens is rolling.

FIG. 6 is a schematic view showing an example of a conventional drive mechanism of an optical axis correcting lens as viewed from the side.

FIG. 7 is a schematic view seen from the optical axis direction.

FIG. 8 is a schematic diagram for explaining the positional relationship between the light emitting unit and the light receiving element when the optical axis correcting lens is rolling.

[Explanation of symbols]

 HV Two orthogonal directions 1 Optical axis correction lens drive mechanism 2 Photographing lens system (main lens system) 3 Correction convex lens (optical axis correction lens) 4 Suspension 5 Driving means X ′ Optical axis of correction convex lens X Main optical axis 16 Position sensor 17 LED (light emitting portion) 18 PSD (light receiving element) 1A Optical axis correction lens drive mechanism 26 Position sensor 27 LED (light emitting portion) 28 PSD (light receiving element)

Claims (4)

[Claims] 1. An optical axis correcting lens disposed in front of a main lens system, a suspension that eccentrically supports the optical axis correcting lens in a substantially plane orthogonal to the optical axis, and the optical axis. Driving means for moving the correction lens to a predetermined position, and a position for separately detecting the position of the optical axis correction lens as a position component obtained by dividing the position of the optical axis correction lens into two components orthogonal to each other in the radial direction. The position sensor comprises a light emitting portion and a light receiving element for receiving the light of the light emitting portion. The light emitting portion is attached to the optical axis correcting lens side, and the light receiving element is attached to the main lens system side. The light receiving element is formed to be long in one direction, and each light receiving element is arranged so that its longitudinal direction substantially coincides with the emission direction centered on the optical axis of the main lens system. Optical axis correction lens drive mechanism. 2. An optical axis correcting lens arranged in front of the main lens system, a suspension which eccentrically supports the optical axis correcting lens in a substantially plane orthogonal to the optical axis, and the optical axis. Driving means for moving the correction lens to a predetermined position, and a position for separately detecting the position of the optical axis correction lens as a position component obtained by dividing the position of the optical axis correction lens into two components orthogonal to each other in the radial direction. The position sensor comprises a light emitting portion and a light receiving element for receiving the light of the light emitting portion. The light emitting portion is attached to the main lens system side, and the light receiving element is attached to the optical axis correcting lens side. The light receiving element is formed to be long in one direction, and each light receiving element is arranged so that its longitudinal direction substantially coincides with the emission direction centered on the optical axis of the optical axis correcting lens. Optical axis correction lens driver Structure. 3. The position sensor comprises two driving means for moving the optical axis correcting lens in directions that respectively coincide with the directions of the two position components for specifying the position of the optical axis correcting lens. The drive mechanism for an optical axis correcting lens according to claim 1 or 2, wherein the drive mechanism is arranged on the opposite side of each of the different drive means with the optical axis interposed therebetween. 4. An optical axis correcting lens is provided with two driving means for moving the optical axis correcting lens in directions that respectively match the directions of the two position components for specifying the position of the optical axis correcting lens, and each position sensor is The driving mechanism for the optical axis correcting lens according to claim 1 or 2, wherein the driving mechanism is arranged on the same side as the respective driving means with respect to the optical axis.