JP2012128322A - Zoom lens drive device with light irradiation, camera, and mobile terminal device with camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive zoom lens drive device with light irradiation, a camera, and a mobile terminal device with the camera.SOLUTION: In a zoom lens drive device 3 with light irradiation, a light irradiating portion 13 comprises a light source 51, an irradiation lens 64 for irradiating an irradiated body with the light of a light source 61, and an irradiation lens holder 65 holding the irradiation lens 64 and provided so as to freely move in an optical axis direction of the irradiation lens. A zoom lens holder 17 is coupled to the irradiation lens holder 65, and the irradiation lens holder 65 is moved while interlocking with the movement of the zoom lens holder 17, thereby expanding or contracting an irradiation range of the light to a subject according to photographing magnification based on a zoom lens.

Description

  The present invention relates to a zoom lens driving device with light irradiation that includes a light irradiation unit that irradiates light to a subject, a camera including the zoom lens driving device with light irradiation, and a mobile terminal device with a camera.

  In Patent Document 1, an optical zoom magnification is set by moving a zoom lens holder to a predetermined position by a motor, and a light source body in which a light source and a reflector are integrated is moved by another motor according to the optical zoom magnification. A zoom lens driving device with light irradiation for expanding or reducing the light irradiation range is disclosed.

JP 2006-27097A

  However, in the technique of Patent Document 1, the zoom lens holder and the light source body are driven by separate motors (driving means), so that there is a problem that the apparatus becomes large and the manufacturing cost increases.

  Therefore, an object of the present invention is to provide a compact and inexpensive zoom lens driving device with light irradiation, a camera, and a mobile terminal device with a camera.

  According to the first aspect of the present invention, a zoom lens holder for holding an optical zoom lens, zoom lens driving means for moving the zoom lens holder in the optical axis direction of the zoom lens, and light for irradiating light toward a subject An irradiation unit, and the light irradiation unit is provided with a light source, an irradiation lens that irradiates light of the light source toward the irradiated object, and an irradiation lens that holds the irradiation lens and is movable in the optical axis direction of the irradiation lens The zoom lens holder is connected to the irradiation lens holder. By moving the irradiation lens holder in conjunction with the movement of the zoom lens holder, the subject is irradiated with light according to the shooting magnification based on the zoom lens. The zoom lens driving device with light irradiation is characterized in that the range is enlarged or reduced.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the zoom lens holder and the irradiation lens holder are integrally formed as a joint support.

  According to a third aspect of the present invention, in the second aspect of the present invention, the zoom lens driving means includes a vibrating member, a driving shaft that vibrates in the axial direction by the vibration of the vibrating member, and a guide shaft that is disposed in parallel with the driving shaft. The drive shaft is provided between the zoom lens holder and the irradiation lens holder, the guide shaft is provided on each of the zoom lens holder side and the irradiation lens holder side, and the joint support is frictionally engaged with the drive shaft. A friction engagement portion that engages with each guide shaft, and a friction engagement portion that moves along the drive shaft due to vibration of the drive shaft and that each guide engagement portion supports jointly. It is characterized by guiding the movement of the body.

  According to a fourth aspect of the present invention, there is provided a camera comprising the zoom lens driving device according to any one of the first to third aspects.

The invention according to claim 5 is a mobile terminal device with a camera, wherein the camera according to claim 4 is mounted.
The mobile terminal device refers to a mobile phone, a personal digital assistant (PDA), a notebook computer, and the like.

According to the first aspect of the present invention, the zoom lens holder is connected to the irradiation lens holder, and the irradiation lens holder is moved in conjunction with the movement of the zoom lens holder. It is possible to move the two members of the lens holder and the irradiation lens holder, and to provide a small and inexpensive zoom lens driving device with light irradiation.
In the light irradiation unit, only the irradiation lens holder is moved, so that the driving force for movement is small compared to the conventional technique in which the light source and the reflector are moved.

  According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and the zoom lens holder and the irradiation lens holder are integrally formed as a joint support, so that the configuration is simple. In addition, the number of parts can be reduced.

  According to the invention described in claim 3, the same effect as that of the invention described in claim 2 is obtained, and the drive shaft provided between the zoom lens holder and the irradiation lens holder is driven and provided on both sides thereof. Since the joint support is guided by the two guide shafts, the joint support can be stably moved with a small number of parts.

  According to the invention described in claim 4, it is possible to provide a camera having the same effects as the invention described in any one of claims 1 to 3.

  According to the invention described in claim 5, it is possible to provide a camera-equipped mobile terminal device having the same operational effects as the invention described in claim 4.

It is a longitudinal section of a camera concerning an embodiment of the invention. It is AA sectional drawing shown in FIG. It is the disassembled perspective view which looked at the camera which concerns on embodiment of this invention from the front side. It is the disassembled perspective view which looked at the camera which concerns on embodiment of this invention from the rear side. It is an optical path diagram explaining the effect | action of the camera which concerns on embodiment of this invention. It is a front view of the mobile telephone carrying the camera which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The camera 1 according to the present embodiment is incorporated in a mobile phone 2 as shown in FIG. 6, and uses a so-called “flash” as necessary when shooting a subject to illuminate the subject in the dark. Irradiation. 3 and 4 are shown upside down with respect to FIGS. 1 and 2.

  As shown in FIGS. 1, 3, and 4, the camera 1 includes a zoom lens driving device 3 with light irradiation and an image sensor 5 provided on a substrate 7. The image sensor 5 is a CCD (Charge Coupled Device) in the present embodiment, but may be a CMOS (Complementary Metal Oxide Semiconductor).

The zoom lens driving device with light irradiation 3 includes a camera lens driving unit 11 that drives a zoom lens (not shown) and a light irradiation unit 13 that irradiates light toward a subject in a housing 15. ing.
The housing 15 has a rectangular front wall when viewed from the subject side (hereinafter referred to as “front side”) in the optical axis direction, and is a rectangular parallelepiped as a whole. The light irradiation unit 13 is provided on the other half.
The camera lens drive unit 11 includes a zoom lens holder 17, a focus lens holder 19, a zoom lens drive unit 21 that drives the zoom lens holder 17, and a focus lens drive unit 23 that drives the focus lens holder 19. .

  Further, as shown in FIG. 2, a zoom lens position detection unit 25 that detects the position of the zoom lens holder 17 and a focus lens position detection unit 27 that detects the position of the focus lens holder 19 are provided in the housing 15. It is provided.

  The zoom lens holder 17 holds an optical zoom lens (not shown) on its inner periphery, and the focus lens holder 19 holds a focus lens (not shown) on its inner periphery. A subject side lens 29 is attached to the lens. 2 to 4, lids 15a and 15b are arranged above and below the housing.

  Since the zoom lens driving unit 21 and the focus lens driving unit 23 have substantially the same configuration, the zoom lens driving unit 21 will be described, and parts having the same effects as the focus lens driving unit 23 are denoted by parenthesized reference numerals. Therefore, the description of the part is omitted.

  The zoom lens driving means 21 (23) is composed of a vibrating member 31 (32) and a driving shaft 33 (34) arranged in the optical axis direction, and the base end of the driving shaft 33 (34) is the vibrating member 31. (32) is fixed. The tip of the drive shaft 33 (34) is held by the housing 15 by a bearing member 37 (38) that slidably holds the drive shaft 33. The bearing member 37 (38) is made of an elastically deformable member, and is made of silicon rubber in the present embodiment. The drive shaft 33 and the drive shaft 34 are parallel to each other. The drive shaft 33 is provided between the zoom lens holder 17 and an irradiation lens holder 65 described later.

  The vibration member 31 is composed of a piezoelectric element and an elastic metal vibrator that is bonded and fixed to the surface of the piezoelectric element. The base end of the drive shaft 33 (34) is formed on the surface of the vibrator. Bonded and fixed.

  On the other hand, as shown in FIG. 2, at one end of the zoom lens holder 17, there is provided a friction engagement portion 39 (40) that frictionally engages with the drive shaft 33 (34). 39 (40) is in frictional engagement with the side surface of the drive shaft 33 (34). The drive shaft 33 (34) vibrates in the axial direction by the vibration of the vibration member 31 (32).

  As shown in FIGS. 3 and 4, the other end portion of the zoom lens holder 17 is provided with a guide engaging portion 43 with the drive shaft 34 of the focus lens holder 19. It engages with the drive shaft 34 of the lens holder 19 to guide the movement of the zoom lens holder 17. The guide engaging portion 43 has a substantially U-shaped cross section, and the drive shaft 34 of the focus lens holder 19 is inserted into the U-shape. That is, the drive shaft 34 of the focus lens holder 19 also serves as the guide shaft of the zoom lens holder 17.

  At the other end of the focus lens holder 19, a guide engagement portion 45 with the drive shaft 33 of the zoom lens holder 17 is provided, and the guide engagement portion 45 is engaged with the drive shaft 33 of the zoom lens holder 17. In addition, the movement of the focus lens holder 19 is guided. The guide engaging portion 45 has a substantially U-shaped cross section, and the drive shaft 33 of the zoom lens holder 17 is inserted into the U shape. That is, the guide shaft 33 of the zoom lens holder 17 also serves as the guide shaft of the focus lens holder 19.

Next, the zoom lens position detecting means 25 for detecting the position of the zoom lens holder 17 and the focus lens position detecting means 27 for detecting the position of the focus lens holder 19 will be described with reference to FIG.
The zoom lens position detection unit 25 and the focus lens position detection unit 27 have the same configuration, and each includes a magnetic pole member 53 in which different magnetic poles (S pole and N pole) are alternately arranged along the optical axis direction of the lens, and a magnetic field. The MR sensor 55 detects the intensity. The magnetic pole member 53 is fixed to the inner surface of the housing 15 along the drive shafts 33 and 34 (see FIGS. 3 and 4), and the MR sensor 55 is fixed to each of the holders 17 and 19, and faces the magnetic pole member 53. In this state, it moves together with the holders 17 and 19 so that the amount and direction of movement of each holder from the reference position (or initial position) can be detected. Each MR sensor 55 derives its detection signal to the outside by a flexible cable 56.

  As shown in FIG. 2, in the camera lens drive unit 11, the drive shaft 33 of the zoom lens holder 17 and the drive shaft 34 of the focus lens holder 19 are one of the rectangular shapes of the camera lens drive unit 11 as viewed from the front side. The zoom lens position detecting means 25 and the focus lens position detecting means 27 described above are provided on the other diagonal line.

  As shown in FIG. 6, the camera control unit 71 is provided with a zoom control unit 73 and a focus control unit 75. The zoom control unit 73 moves the zoom lens holder 17 to a predetermined magnification position input by setting of a magnification setting unit (not shown), or continuously drives the zoom lens holder 17 to stop at a predetermined position. Set to optical magnification. After the zoom lens holder 17 is stopped, the focus control unit 65 drives the focus lens holder 17 by the focus lens driving unit 23 so that the focus position is reached on the surface of the image sensor 5.

Next, the light irradiation unit 13 will be described. As shown in FIGS. 1 and 3, the light irradiation unit 13 includes a light source 61, a reflector 63, and an irradiation lens holder 65 that holds an irradiation lens 64.
The light source 61 is an LED (light emitting diode) in the present embodiment, but may be a flashlight using a discharge tube, a light source that emits laser light, or the like.

  The irradiation lens holder 65 is connected to the zoom lens holder 17, and the irradiation lens holder 65 and the zoom lens holder 17 serve as an integral joint support 67.

  The irradiation lens 64 is a condensing lens, but other lenses such as a Fresnel lens may be used.

The reflector 63 has a substantially hemispherical shape with the front side being a concave reflecting surface (surface), and an insertion hole for the light source 61 is formed on the rear side.
The irradiation lens holder 65 is provided with a guide engaging portion 66 on the side opposite to the zoom lens holder 17, and the guide engaging portion 66 is disposed on the housing 15 in parallel with the drive shafts 33 and 34. 68 is engaged. Thus, the joint support 67 composed of the zoom lens holder 17 and the irradiation lens holder 65 is driven by the drive shaft 33 and the movement is guided by the engagement of the drive shaft 34 and the guide shaft 68. It has become.

  In the present embodiment, as shown in FIG. 1, when the irradiation lens 64 is located on the foremost side and the distance between the light source 12 and the irradiation lens 64 is the farthest, the irradiation angle, that is, the divergence from the irradiation lens 64. This is a case where the angle is the smallest and the irradiation range for the subject P is the narrowest. When the irradiation lens 64 moves rearward, the irradiation angle increases and the irradiation range for the irradiated object P increases.

  As shown in FIG. 5, in the present embodiment, the irradiation lens holder 65 is provided as a joint support 67 integral with the zoom lens holder 17, and therefore, the irradiation lens holder 65 has the same amount of movement as the zoom lens holder 17 moves. Move.

In order to change the shooting range, the zoom lens holder 17 is moved in the optical axis direction to change the angle of view. The irradiation angle changes accordingly. That is, when the photographing range is widened, the irradiation range is widened, and when the photographing range is narrowed, the irradiation range is narrowed. Here, it is desirable to set the irradiation angle slightly wider than the angle of view. For example, the angle is 1 to 5 degrees larger than the shooting angle of view. For this purpose, it is necessary to match the design of the light irradiation unit 13 side to the camera lens drive unit 11 side, but by adjusting the shape, refractive index, etc. of at least one of the irradiation lens 64 and the subject side lens 69. Can be easily adapted.
It should be noted that the adjustment of the irradiation range with respect to the imaging range can be easily performed because optical precision is not required.

Next, functions and effects of the camera 1 according to the embodiment of the present invention will be described.
When the light irradiation unit 13 is used when shooting with the camera 1, as described above, when the zoom lens holder 17 is moved together with the joint support 67 to a predetermined shooting magnification position by the zoom control unit 73, it is integrated with the joint support 67. The irradiation lens holder 65 also moves.
As a result, the irradiation lens holder 65 moves to a position where it illuminates the irradiation range corresponding to the photographing range of the zoom magnification set by the camera lens driving unit 11 and stops.

Thereafter, an electric current is supplied to the light source 61 in conjunction with the shutter of the camera 1 so that the light source 61 emits light and irradiates the subject with light.
That is, according to the present embodiment, as shown in FIG. 5, the zoom lens 18 is moved to set the zoom magnification, and the irradiation range can be enlarged or reduced according to the shooting angle of view of the set zoom magnification. it can.

Further, according to the present embodiment, the irradiation lens holder 65 is integrally connected to the zoom lens holder 17 by the joint support 67, and the irradiation lens holder 65 is moved in conjunction with the movement of the zoom lens holder 17. Therefore, the zoom lens holder 17 and the irradiation lens holder 65 can be moved only by the zoom lens driving means 21. That is, when the zoom lens holder 17 and the irradiation lens holder 65 are separate from each other, first, the photographing field angle of the camera is calculated, the position of the irradiation lens holder 65 that becomes an appropriate irradiation angle is calculated, and the irradiation lens is moved to that position. An arithmetic circuit and a control circuit for moving the holder are required. However, in this embodiment, since the zoom lens holder 17 and the irradiation lens holder 65 are integrated, such an arithmetic circuit and a control circuit are unnecessary. Therefore, it is possible to provide a zoom lens driving device 3 with light irradiation that is smaller and less expensive.
In the light irradiation unit 13, only the irradiation lens holder 65 is moved, so that the driving force for movement can be reduced as compared with the conventional technique in which the light source 61 and the reflector 63 are moved.

  Since the zoom lens holder 17 and the irradiation lens holder 65 are formed as an integrally formed joint support 67, the mechanical configuration is simple and the number of parts can be reduced.

  The joint support 67 is supported by the drive shaft 33 provided between the zoom lens holder 17 and the irradiation lens holder 65 and moves, and the movement is guided by the guide shaft 68 and the drive shaft 34 provided on both sides thereof. Therefore, the joint support body 67 can be stably moved with a small number of parts.

Since the zoom lens driving means 21 can vibrate the drive shaft 33 by the vibration member 31 and move the joint support 67 forward and backward, drive control can be easily performed with a simple configuration.
Since the camera lens driving unit 11 and the light irradiation unit 13 are housed in one housing 15 and are driven by the zoom lens driving unit 21 and the driving unit is shared, the overall size of the apparatus is reduced. In addition, the mounting density can be increased and the apparatus can be downsized.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the light irradiation apparatus 1 is used as a camera flash in a camera-equipped mobile phone in the above-described embodiment, but is not limited thereto, and may be used in a microscope or the like.
The zoom lens holder 17 and the irradiation lens holder 65 are not limited to be integrally formed by the joint support body 57, but may be interlocked with each other via a gear that meshes with the zoom lens holder 17 and the irradiation lens holder 65. .
The zoom lens driving means 21 may be other driving means such as a stepping motor.

DESCRIPTION OF SYMBOLS 1 Camera 3 Lens drive device with light irradiation 11 Camera lens drive device 13 Light irradiation part 15 Case 17 Zoom lens holder 21 Zoom lens drive means 63 Reflector 65 Irradiation lens holder 67 Joint support body

Claims (5)

A zoom lens holder for holding the optical zoom lens, a zoom lens driving means for moving the zoom lens holder in the optical axis direction of the zoom lens, and a light irradiation unit for irradiating light toward the subject,
The light irradiation unit includes a light source, an irradiation lens that irradiates light of the light source toward the irradiated object, and an irradiation lens holder that holds the irradiation lens and is provided so as to be movable in the optical axis direction of the irradiation lens.
The zoom lens holder is connected to the irradiation lens holder. By moving the irradiation lens holder in conjunction with the movement of the zoom lens holder, the irradiation range of light on the subject is expanded or reduced according to the shooting magnification based on the zoom lens. A zoom lens driving device with light irradiation, characterized in that:   2. The zoom lens driving apparatus with light irradiation according to claim 1, wherein the zoom lens holder and the irradiation lens holder are formed as an integrally formed joint support.   The zoom lens driving means includes a vibrating member, a driving shaft that vibrates in the axial direction by the vibration of the vibrating member, and a guide shaft that is arranged in parallel with the driving shaft. The driving shaft is disposed between the zoom lens holder and the irradiation lens holder. The guide shaft is provided on each of the zoom lens holder side and the irradiation lens holder side, and the joint support is a friction engagement portion that frictionally engages the drive shaft and a guide engagement that engages each guide shaft. 3. The friction engagement portion moves along the drive shaft by the vibration of the drive shaft, and each guide engagement portion guides the movement of the joint support body. Zoom lens drive with light irradiation.   A camera comprising the zoom lens driving device with light irradiation according to claim 1.   A camera-equipped mobile terminal device comprising the camera according to claim 4.

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