CN100470357C - Lens barrel - Google Patents

Abstract

Provided is a lens barrel which has thin thickness in a direction parallel with the incident optical axis (1st optical axis) of subject light, and is miniaturized. The lens barrel 10 has a 1st group frame 31 and a fixed frame 32, and incorporates a prism to refract subject luminous flux from the incident optical axis O1 to an optical axis O2 in a direction perpendicular thereto in the 1st group frame. A 2nd group frame 38 to hold a 2nd group lens 35 capable of moving forward and backward in the direction of the optical axis O2 is arranged in the frame 32, and a CCD 55 to convert a subject image to an electric image pickup signal is arranged below the frame 38. The ND filter of an ND filter unit 47 arranged on the lower surface part of the frame 31 and the sector of a shutter unit 48 arranged on the upper surface part of the frame 38 are arranged slidingly movably in a right-and-left direction orthogonal to an optical axis plane including the optical axis O1 and the optical axis O2 respectively in order to adjust light quantity. Accordingly, the lens barrel is thinned in thickness in a front-and-rear direction.

Description

Lens drum

Technical field

The present invention relates to a kind of lens drum structure.

Background technology

Patent documentation 1 spy opens flat 11-No. 84209 communiques (the 0017th section～the 0023rd section)

In the past, by at the shot object image acquiring unit that the shot object image that is formed by the light beam that incides the photographic optical system that a plurality of lens combination etc. constitute is configured in assigned position, for example, charge coupled cell imaging apparatuss such as (CCI) or take pictures with imaging on the sensitive surface of photosensitive materials such as film, the camera that obtains desired shot object image information or subject image are extensively popularized and practicability.

To this camera, require further miniaturization, the miniaturization of special requirement camera thickness direction, the miniaturization that therefore includes the lens drum of photographic optical system is indispensable.

Lens drum as uses such as above-mentioned cameras, for example, proposed to use so-called dioptric system to make equipment miniaturization, this dioptric system is configured in the reflection part that is made of catoptron etc. in the light path of photography with a plurality of lens combination etc., camera axis to the prescribed direction complications.

Patent documentation 1 has proposed to use the lens drum of above-mentioned tortuous optical system, this lens drum adopts following structure: obtain object light by prism, make the camera axis complications by this prism simultaneously, to the above-mentioned object light of optical system incident that constitutes by a plurality of lens combination.The optical axis of the incident light that incides above-mentioned prism as the 1st optical axis, the optical axis of a plurality of lens combination after the complications as the 2nd optical axis.

, generally be built-in with light amount adjusting devices such as adjusting the shutter of light quantity and aperture unit according to the brightness of subject in the above-mentioned lens drum and be used for focal adjustments, become lens actuating device doubly.

Above-mentioned patent documentation 1 disclosed lens drum, also between above-mentioned a plurality of lens combination, dispose the said aperture unit, utilize the aperture unit drive source that the position change of the aperture blades of this aperture unit is arrived and the parallel direction of above-mentioned the 1st optical axis, carry out the light quantity adjustment thus.And, utilize the zoom motor and focus on motor above-mentioned a plurality of lens combination are carried out doubly driving to focal adjustments driving, the change of the 2nd optical axis direction.Said aperture unit drives source and above-mentioned zoom motor, focusing on motor, to be configured in the 1st optical axis be each angle in the rectangular parallelepiped at center.

But, in the above-mentioned patent documentation 1 disclosed lens drum, as the driving direction of the aperture blades of light amount adjusting device is the parallel direction of optical axis (the 1st optical axis) with the object light that incides prism, so may not be the suitable construction along the thickness slimming of above-mentioned the 1st optical axis direction that realizes lens drum.In order to make lens drum accomplish fully to approach, realize the miniaturization of camera, must consider the driving direction of above-mentioned light amount adjusting device, to consider also that simultaneously the drive source of light amount adjusting device and the advance and retreat of lens combination drive the configuration of using drive source.

Summary of the invention

In view of above situation, the object of the present invention is to provide a kind of lens drum, can consider the driving direction of light amount adjusting device, consider that simultaneously the light amount adjusting device driving is used and lens drive the configuration of using drive source, make the thickness direction of lens drum, i.e. the thickness attenuation of the direction parallel, make the further miniaturization of camera with the incident light axis (the 1st optical axis) of object light.

The present invention relates to a kind of lens drum, have the variable-power optical system that is made of a plurality of lens combination, this lens drum is characterised in that this lens drum possesses:

Reflection optics, it makes light beam along the 1st optical axis from subject incident along the 2nd optical axis reflection that intersects with above-mentioned the 1st optical axis;

The the 1st, the 2nd movable lens set along above-mentioned the 2nd optical axis configuration;

Keep above-mentioned the 1st movable lens set, make it can change the 1st movable framework that keeps of position along above-mentioned the 2nd optical axis;

Keep above-mentioned the 2nd movable lens set, make it can change the 2nd movable framework that keeps of position along above-mentioned the 2nd optical axis;

Shutter unit, it has curtain-shaped cover member, this curtain-shaped cover member changes the position integratedly along above-mentioned the 2nd optical axis and the above-mentioned the 1st movable framework that keeps, with the plane of above-mentioned the 2nd optical axis approximate vertical in, can move to position of covering the exposure opening and the position of opening this exposure opening, above-mentioned curtain-shaped cover member moves in the direction with the plane approximate vertical that comprises above-mentioned the 1st optical axis and above-mentioned the 2nd optical axis;

The ND light filter, this ND light filter is in the plane vertical with above-mentioned the 2nd optical axis, can move to position that enters in the light path of photography and the position of avoiding light path of photography, this ND light filter moves in the direction with the plane approximate vertical that comprises above-mentioned the 1st optical axis and the 2nd optical axis;

Drive the shutter drive source of above-mentioned curtain-shaped cover member;

Drive the light filter drive source of above-mentioned ND light filter; With

Make the above-mentioned the 1st movable framework and the 2nd movable lens driving unit that keeps framework along the 2nd optical axis change position of keeping,

Wherein, above-mentioned shutter disposes at the 1st optical axis direction with drive source side by side with drive source and above-mentioned light filter, the said lens driver element have the 1st optical axis direction side by side configuration, drive the above-mentioned the 1st, the 2nd movable two axles that keep framework respectively, and these two axles be configured in above-mentioned relatively shutter with drive source and light filter with drive source in the 2nd optical axis direction straight line position of staggering roughly

And wherein, above-mentioned two axles rotate together when zoom drive, drive the above-mentioned the 2nd movable axle rotation that keeps framework when focusing on action.

Description of drawings

Fig. 1 is the exploded perspective view of Electrofax that is built-in with the lens drum of one embodiment of the present invention.

Fig. 2 is the square frame pie graph of circuit of the Electrofax of above-mentioned Fig. 1.

Fig. 3 is the exploded perspective view when dorsal view is seen the lens drum of Electrofax of above-mentioned Fig. 1.

Fig. 4 is the exploded perspective view when dorsal view is seen the lens drum of Electrofax of above-mentioned Fig. 1.

Fig. 5 is the wide-angle state longitudinal diagram when watching the lens drum of above-mentioned Fig. 3 from the front.

Fig. 6 is the state of the looking in the distance longitudinal diagram when watching the lens drum of above-mentioned Fig. 3 from the front.

Fig. 7 is the sectional view of the A-A line along above-mentioned Fig. 5.

Fig. 8 is the sectional view of the D-D line along above-mentioned Fig. 6.

Fig. 9 is the sectional view of the B-B line along above-mentioned Fig. 5.

Figure 10 is 1 framing (ND filter elements) exploded perspective view on every side of the lens drum of above-mentioned Fig. 3.

Figure 11 be the C of above-mentioned Fig. 5 to view, the slewing area of expression shutter actuating arm.

Figure 12 is the shutter unit exploded perspective view on every side of the lens drum of above-mentioned Fig. 3.

Figure 13 be E-E of Figure 12 to view, Figure 13 (A) expression shutter open mode, Figure 13 (B) expression shutter close state.

Figure 14 be the expression lens drum that is applicable to above-mentioned Fig. 3 the shutter actuating arm shape and be adhesively fixed with the figure of mould installment state, Figure 14 (A) is the amplification profile of shutter actuating arm, and to be expression be bonded in the amplification profile that is adhesively fixed with on the anchor clamps time to the installation of shutter actuating arm and axial region to Figure 14 (B).

Figure 15 is the oblique view of watching from the front when connecting on the lens drum that FPC is installed in above-mentioned Fig. 3.

Figure 16 is the oblique view of watching from the back side when connecting on the lens drum that FPC is installed in above-mentioned Fig. 3.

Figure 17 is the planimetric map of modified example of ND filter elements that is applicable to the lens drum of above-mentioned Fig. 3.

Embodiment

Below, with reference to the description of drawings embodiments of the present invention.

Fig. 1 is the exploded perspective view of Electrofax that is built-in with the lens drum of one embodiment of the present invention.

In the following description, along the incident direction of subject light beam shown in Figure 1 promptly the direction of the 1st optical axis O1 as the Z direction, Z (+) direction of the object side direction of Electrofax is made as the place ahead, Z (-) direction of camera rear side direction is made as the rear.Being made as the Y direction perpendicular to the above-below direction in the direction of Z direction, Y (+) direction is made as direction, Y (-) direction is made as down direction.Being made as directions X perpendicular to the left and right directions in the direction of Z direction, X (+) direction when object side is watched camera be made as right, X (-) direction be made as left to.

The Electrofax 1 of present embodiment shown in Figure 1 is so-called digital camera, has protecgulum 2 and bonnet 3 as exterior member, contains following formation unit in above-mentioned protecgulum 2 and bonnet 3: lens drum 10; Circuit board unit 5; Power supply unit 6; Strobe light unit (strobo unit) 7; Flashlight charging electric capacity 8; LCD unit 9 as display unit; With underframe 24.

On the front face of above-mentioned protecgulum 2, disposing the photographic window 2a and the flashlamp light-emission window 2b that are used to obtain the subject light beam.

Disposing the release-push 26 of 2 grades of operations and the power knob 27 of switching power supply on face on the above-mentioned bonnet 3, its back side portion is provided with LCD peristome 3a.Being fixed with transparent component with the state that covers above-mentioned LCD peristome 3a in the one of the back side of above-mentioned bonnet 3 is transparent panel 4.

The profile of said lens tube 10 roughly is rectangular shape, it is under the mounted state of camera, have along the front face on X, Y plane, than length direction is the Y direction, the thinner thickness of Z direction, to accommodate reflection optics be prism 33 to quadrate part thereon, and this prism 33 is formed for obtaining the tortuous optical system along the subject light beam of the 1st optical axis O1 (Z direction).The rear portion forms dip plane 31c (Fig. 3) above the lens drum.

This lens drum 10 makes the subject light beam of the 1st optical axis O1 direction of being obtained by above-mentioned prism 33 reflect to the 2nd optical axis O2 direction, is imaged on the imaging surface that imaging apparatus is CCD55 by Photographical lens system described later, and is converted into the image pickup signal of shot object image.Its detailed structure will be narrated in the back.

Foregoing circuit plate unit 5 is configured in the side of said lens tube 10, has three printed wiring boards 18,19,20 of each controlling element of the circuit that Electrofax described later has been installed, and recording medium slot 21 in the installed inside of above-mentioned printed wiring board 20.Printed wiring board 18,19,20 is connected by flexible printed wiring board (hereinafter referred to as FPC) 22,23, and is accommodated with three overlapping states along above-mentioned optical axis O1 direction.

Above-mentioned power supply unit 6 is configured in the side of said lens tube 10, is made of with battery 12 battery case 11 and the camera power supply that inserts and be housed in the battery case 11, and it is rectangular shape, has along the plane of XY face expansion, the thinner thickness of Z direction.

Above-mentioned strobe light unit 7 constitutes by flashlamp main body 13 with by the flashlamp luminotron 14 of the Reflection umbrella inner support of flashlamp main body 13.

Above-mentioned LCD unit 9 is by constituting with the lower part: having along the LCD panel of the display surface on X, Y plane is LCD display board 15; Be configured in the upper side position of LCD display board 15 and the LCD illumination light source 16 that extends to directions X; Roughly cover the light guide plate 17 of anti-display surface one side of LCD display board 15.The wall thickness of above-mentioned light guide plate 17 changes in the Y direction, and the top of light source side forms heavy wall, and the below forms thin-walled.

The following describes and respectively constitute the state of unit housing in forward and backward lid 2,3 above-mentioned, at first, make the central portion of front face (the 2nd outer wall 32j) the contact underframe 24 of lens drum 10, and fixing with screw 25, these underframe 24 usefulness sheet metals form, and have along the plane of XY face expansion.Printed wiring board 20 sides of circuit board unit 5 and media slot 21 together with the state of the left side adjacency of the lens drum 10 of the substantial middle that is configured in underframe 24, fixing with screw 25.And then, power supply unit 6 with the state of the right side adjacency of lens drum 10, fixing with screw 25, lens drum 10, circuit board unit 5 and power supply unit 6 are become one.Strobe light unit 7 is fixed on the top of power supply unit 6, and flashlight charging enters the state at rear of upper angled face 31c of lens drum 10 with the rear from strobe light unit 7 with electric capacity 8 fastened.

On the other hand, in the inside of bonnet 3, LCD unit 9 is fixed and is configured to make the display surface state relative with peristome 3a of LCD display board 15.

The underframe 24 of lens drum 10, circuit board unit 5 and power supply unit 6 has been installed has been accommodated, and be fixed, finished Electrofax 1 thus by connecting above-mentioned protecgulum 2 and above-mentioned bonnet 3 with the state that is clipped in above-mentioned protecgulum 2 and the above-mentioned bonnet 3.

Accommodate under the state above-mentioned, the relative configuration of photographic window 2a of the incident peristome of the prism 33 of lens drum 10 and protecgulum 2, the luminous component of strobe light unit 7 is configured in the rear of flashlamp light-emission window 2b.And LCD unit 9 is positioned at battery unit 6 and lens drum 10 and is the position of overlap condition, and relative with the LCD peristome 3a of bonnet 3.

Accommodate under the state above-mentioned, the Z direction thickness (occupying the space) of Z direction thickness of adding up in lens drum 10, power supply unit 6 and LCD unit 9 and circuit board unit 5 about equally.In addition, the Y direction height of lens drum 10 and LCD unit 9 about equally.

Below, the circuit of the Electrofax 1 of the square frame pie graph explanation present embodiment of use Fig. 2.

It is CPU170 that the Electrofax 1 of present embodiment is built-in with control module, is come each controlling element of whole this Electrofax 1 of control by above-mentioned CPU170.

At first, the image of the subject by photographic optical system 111 is that CCD55 converts electric signal to by imaging apparatus under the control of above-mentioned CPU170.Electric signal by after the CCD55 conversion converts analog picture signal to by imaging circuit 113, converts data image signal to by A/D change-over circuit 114 then.Then, this data image signal for example is recorded in flash memory cards that external memory storage promptly can load and unload, the intelligent memory card recording medium cards (storage card) 120 as recording medium such as (smart memorycard) by interface (I/F) 121.Recording medium card 120 can load and unload in the media slot 21.

Be provided with processing speed fast internal memory 130 and image processing circuit 140 in the circuit of Electrofax 1, this internal memory 130 for example can use random-access memory (ram) etc., is used as the cache memory of the working storage or the intermediate images storage unit of each Flame Image Process.Above-mentioned image processing circuit 140 carries out the conversion to rgb signal, the conversion of pixel count, the processing such as compression and decompression of data according to by the view data after 114 digitizings of A/D change-over circuit.

Aforesaid image is installed in the Electrofax 1 shows, on this LCD display board 15, confirm to be recorded in the image in the storage card 120, or show the subject image that to photograph with LCD display board 15 (liquid crystal indicators).After being presented at image on the LCD display board 15 and being image information from internal memory 130 and being taken into video memory 151 for the time being, the image that converts video image to and show by video output circuit 152.Video output circuit 152 also can be by video output with outside terminal 153, to the exterior display device output video image.

Above-mentioned CPU170 obtains the photography commencing signal according to the operation of above-mentioned release-push 26, is made a video recording by CCD55, or obtains the setting signal of the various patterns of operating portion 173 according to the operation of not shown mode initialization button, carries out the setting of photograph mode.This setting pattern is displayed on the mode LCD 172.In addition,, during deficiency in light quantity when subject is made a video recording, the flashlamp luminotron 14 of strobe light unit 7 is connected, carried out strobo photography according to the control of CPU170.

Carrying out the focusing driving of photographic optical system and the lens drive source of zoom drive is that the 1st, 2 stepper motors 53,54 connect CPU170 by driver 171, carries out lens by above-mentioned motor and drives.

The object light amount adjusting apparatus, the ND light filter that promptly is used for driving N D filter elements is connected CPU170 with solenoid 52 by driver 171 with the shutter that is used to drive shutter unit with solenoid 51, carries out the light quantity adjustment by above-mentioned solenoid and drives.

Be used to detect the detecting unit of the reset position that the advance and retreat of photographic optical system move, promptly reflective optical system (hereinafter referred to as PR) 58,59 connects CPU170, and the reset position when carrying out the reset drives of above-mentioned Photographical lens system 111 detects.

(exterior I/F) 161 connect outside input and output terminal 160 to external interface, carry out the data input and output with external mechanical.This outside input and output terminal 160 for example connects PC etc., and the images in the storage card 120 are sent to PC etc., and obtains view data from PC etc.

Electric power from the battery 12 of power supply unit 6 is supplied with each controlling element of these Electrofaxs 1 by power supply unit 180, and drives.Battery 12 can charge by the control of power supply unit 180.

Below, use Fig. 3～Figure 13 that the concrete structure of said lens tube 10 is described.

Fig. 3, Fig. 4 are the exploded perspective views when dorsal view is seen above-mentioned lens drum.Fig. 5 is the longitudinal diagram of the wide-angle state when watching the said lens tube from the front.Fig. 6 is the longitudinal diagram of the state of looking in the distance when watching the said lens tube from the front.Fig. 7 is the sectional view of the A-A line along Fig. 5, and Fig. 8 is the sectional view of the D-D line along Fig. 6, and Fig. 9 is the sectional view of the B-B line along Fig. 5.Figure 10 is 1 framing (ND filter elements) exploded perspective view on every side of said lens tube.Figure 11 be the C of Fig. 5 to view, the slewing area of expression shutter actuating arm.Figure 12 is the exploded perspective view around the shutter unit.Figure 13 (A) be E-E of Figure 12 to view, expression shutter open mode.Figure 13 (B) be E-E of Figure 12 to view, expression shutter close state.Figure 14 (A) is the amplification profile of shutter actuating arm.Figure 14 (B) is that expression is installed in axial region to shutter actuating arm and axial region and is adhesively fixed with the amplification profile of the state on the anchor clamps.Oblique view when Figure 15 is the said lens tube of watching from the front under the connection FPC installment state.Oblique view when Figure 16 is the said lens tube of watching from the back side under the connection FPC installment state.

Shown in Fig. 5 waits, it is that 1 framing 31 and frame parts are fixed frame 32 that said lens tube 10 has the 1st maintenance framework, and the parts that are built in above-mentioned 1 framing 31 are that reflection optics is that prism 33,1 group of lens 34, light quantity adjustment unit are that ND filter elements 47, light filter are that the ND light filter is shutter solenoid 52 etc. with helical spiral pipe (hereinafter referred to as solenoid) 51 and shutter with drive source (segment drive source) with drive source.The parts that are located at said fixing framework 32 inside are that the light quantity adjustment unit (shutter unit) along optical axis O2 arranged in order is a shutter unit 48, zoom 2 groups of lens 35 of lens combination by the 2nd maintenance framework that can advance and retreat below it (the 1st movable framework that keeps) i.e. 2 framings, 38 maintenances, zoom by the 3rd maintenance framework that can advance and retreat (the 2nd movable framework that keeps) i.e. 3 framings, 39 maintenances, focusing is 3 groups of lens 36 with lens combination, 4 groups of lens 37 that keep by the 32b of lower opening portion of fixed frame 32, be installed on the CCD substrate 56 and be positioned at the imaging apparatus CCD55 of the image space of subject light beam.Be two ends along about the 2nd optical axis O2 (being the Y direction) by fixed frame 32 fixing hanging axis 41 and the spline axles 42 that keep, be used to drive zoom drive the 1st lens that use, that constitute electric motor units of 2 framings, 38 advance and retreat with the 1st stepper motor 53 of drive source, be used to drive 3 framings, 39 advance and retreat zoom, focus on and drive usefulness, the 2nd lens of formation electric motor units are with the 2nd stepper motor 54 of drive source and be inserted in compression spring 46 between above-mentioned 2 framings 38 and 3 framings 39 etc.Installing and fixing sheet metal system fixed cap 89 at the back side of fixed frame 32.The FPC86 of electrical connection sections such as splicing ear that above-mentioned each drive source is installed, sensor in the former configuration of fixed frame 32.

The above-mentioned the 1st keeps framework 31 to have the profile that partly is made of rectangular shape profile part and triangular prism shape profile, be used to accommodate above-mentioned prism, above-mentioned 1 group of lens, above-mentioned ND filter elements, above-mentioned solenoid etc., and be connected with screw screw hole 32f by screw, screw insertion hole 31f on the top of fixed frame 32, wherein, the following direction of principal axis of triangular prism shape profile part is a directions X, and this direction of principal axis has along the dip plane 31c that is housed in the profile that keeps the prism 33 in the side part of framework back.

Above-mentioned prism 33 is inserted among the 31a of front openings portion of stuck-at-framing 31.Subject light beam along optical axis O1 incident passes through 90 ° of these prism 33 complications, along the 2nd optical axis O2 (Y direction) peristome 31b reflection downwards.

Above-mentioned 1 group of lens 34 are inserted into the bottom of the 31b of lower opening portion that remains on 1 framing 31.

It is ND light filter 67 that above-mentioned ND filter elements 47 has the light quantity adjustment component, and this ND light filter 67 is installed in the following side of 1 framing 31, can move to the direction with the axial plane approximate vertical that comprises optical axis O1 and optical axis O2, to adjust the subject light quantity.Its concrete structure will be narrated in the back.

Above-mentioned ND light filter side by side is configured in the left side of prism 33 1 framing 31 in location mode along the 1st optical axis O1 with solenoid 52 with solenoid 51 and shutter, and output shaft 51a, 52a separately is configured to the optical axis O2 of the below of 1 framing 31 direction outstanding (Figure 10).On the output shaft 51a of above-mentioned ND light filter, be fixedly connected with pinion wheel 61 with solenoid 51.On the other hand, being fixedly connected with the driving force transferring elements on the output shaft 52a of shutter with solenoid 52 is shutter actuating arm 71.On the arm top of above-mentioned shutter actuating arm 71, fixedly connected the axial region 72 that forms by the hollow axial region of the specified length corresponding with the advance and retreat shift position of 2 groups of lens.Above-mentioned solenoid just is driven to be changeed, reverses, and above-mentioned output shaft 51a, 52a are driven and rotate, and above-mentioned thus pinion wheel 61 or above-mentioned shutter actuating arm 71 are driven the open position that turns to separately and close these two turned positions, position.To narrate in the back about the ND filter elements of being undertaken and the action of shutter unit by pinion wheel 61 or axial region 72.

Two guide hole 38c, the spline otch 38g that is positioned at the opposition side of guide hole 38c, the guider screw that above-mentioned 2 framings 38 have the peristome 38a that is positioned at central upper, connect along the Y direction inserts with otch 38d, bar rotational axis hole 38e, 4 ladder pin (section つ I PVC Application) 38b and the stop projection (Department that is positioned at Z direction both ends of the surface and ends projection) 38f etc. (Figure 12).In addition, on 2 framings 38, except 2 groups of lens 35 that become zoom lens, on peristome 38a side, also dispose above-mentioned shutter unit 48, in above-mentioned bar axis hole 38e, can embed segment driving stem 43 rotationally.This 2 framing 38 is being supported by the hanging axis 41 and the spline axle 42 that embed guide hole 38c and otch 38g respectively with being free to slide, and can move along optical axis O2 advance and retreat.

Above-mentioned shutter unit 48 has i.e. the 1st, the 2nd segment 74,76 of two curtain-shaped cover members, and these two curtain-shaped cover members can open and close mobile in the direction vertical with the axial plane of optical axis O2 with comprising optical axis O1, and its concrete structure will be narrated in the back.

Above-mentioned 3 framings 39 have two guide hole 39b, spline otch 39c and the guider screw insertion otch 39d relative with guide hole 39b that connects along the Y direction, in central opening portion 3 groups of lens 36 as zoom, condenser lens are installed.

Above-mentioned the 1st stepper motor 53 has coil portion 53b and 4 the splicing ear 53d (Fig. 5, Fig. 9) that motor main body, the rotor portions 53c of fastening guider screw axle 81, top are provided with the 53a of bearing portion that is used to support other.

The 2nd stepper motor 54 has coil portion 54b and 4 the splicing ear 54d (Fig. 5, Fig. 9) that motor main body, the rotor portions 54c of fastening guider screw axle 83, top are provided with the 54a of bearing portion that is used to support other.

As Fig. 5, shown in Figure 9, above-mentioned the 1st, the 2nd stepper motor 53,54 is left side wall 32k inboard by the 1st outer wall that motor mounting plate 85 is fixedly supported on fixed frame 32.Promptly, the above-mentioned the 1st, the 2nd stepper motor 53,54 following installations: at 2 of fixed frame 32,3 framings 38,39 allocation position left side, and at above-mentioned solenoid 51, the linearity region parallel of 52 belows following with optical axis O2, last position, make guider screw opposed mutually, rotor portions 53c and coil portion 53b and rotor portions 54c and coil portion 54b are installed in the upper and lower side of above-mentioned motor mounting plate 85 with the state along the axial plane that comprises optical axis O1 and optical axis O2, above-mentioned motor mounting plate 85 usefulness register pin 32p are positioned, and utilize screw 49 to be fixed in left side wall 32k inboard.

Under the installation holding state of above-mentioned stepper motor, the 1st stepper motor 53 is positioned at the below, and make guider screw axle 81 up, the 2nd stepper motor 54 is positioned at the top, and make guider screw axle 83 down, and the top separately of these guider screw axles 81,83 can embed the 54a of bearing portion, the 53a of the opposing party's stepper motor 54,53 respectively rotationally, and is being supported by it.

Therefore, under the installment state of above-mentioned stepper motor 53,54, guider screw axle 81,83 is configured to comprise optical axis O1 parallel with the axial plane of optical axis O2, and the state parallel with optical axis O2.Above-mentioned solenoid 51,52 is configured on the parallel linearity region of optical axis O2 side with above-mentioned stepper motor 53,54.

2 framing drive nuts 82 screw above-mentioned guider screw axle 81, the 3 framing drive nuts 84 of embedding and screw the above-mentioned guider screw axle 83 of embedding.Cross over the last facial 38h (Figure 12) of the otch 38d of 2 framings 38 that guider screw axle 81 inserts, rely on the elastic force (paying Potential power) of compression spring 46 contact the above-mentioned 2 framing drive nuts 82 that screw below, and by bullet upward to.The lower face 39h of the otch 39d of 3 framings 39 that leap guider screw axle 83 inserts, above the above-mentioned 3 framing drive nuts 84 that screw of elastic force contact of dependence compression spring 46, and by the bullet downward direction.

As mentioned above, by moving of each drive nut 82,84,2,3 framings 38,39 are being driven advances and retreat, and a direction is partial in the gap that screws of each drive nut 82,84 and each guider screw axle 81,83 simultaneously.

Therefore, utilize stepper motor 53 that guider screw axle 81 is rotated, 2 framings 38 are being driven along optical axis O2 by 2 framing drive nuts 82 and are advancing and retreat the position to looking in the distance at the wide-angle position (reset position) from Fig. 5.Equally, utilize stepper motor 54 that guider screw axle 83 is rotated, 3 framings 39 are being driven along optical axis O2 by 3 framing drive nuts 84 and are advancing and retreat the position to looking in the distance of Fig. 6 at the wide-angle position (reset position) from Fig. 5.When the reset processing action of carrying out stepper motor 53,54,2 framings 38 and 3 framings 39 move to the direction that resets, one arrives above-mentioned each reset position, is that reflective optical system (hereinafter referred to as PR) 58,59 (Fig. 7,15) detects the above-mentioned reset position of arrival by detecting unit described later then.

Like this, when zoom, drive stepping motor 53,54, drive be used to keep zoom lens promptly 2 groups of lens 35 2 framings 38 and keep zoom, focus on 3 framings 39 with 3 groups of lens 36.At this moment, be benchmark with above-mentioned PR58,59 reset positions that detected, judge the drive amount of 2 framings, 38,3 framings 39 according to the driving number of steps of above-mentioned stepper motor 53,54, so can calculate the change times state of optical system according to above-mentioned driving number of steps.

And focusing on driving is by driving above-mentioned stepper motor 54,3 framings 39 being carried out in optical axis O2 direction change position.

Above-mentioned ND filter elements 47 is configured between following and fixed frame 32 top of 1 framing 31, shown in the exploded perspective view of Figure 10, has: with the loose pulley 62 of ND light filter with output pinion 61 engagements of solenoid 51; ND light filter driven wheel 63 with loose pulley 62 engagements; Be installed in the base plate 64 that being used on 1 framing 31 keeps said gear; Two ends are provided with the light filter actuating arm 65 of pin-and- hole 65a, 65b; Be provided with the ND light filter antisitic defect sheet 66 of the 66a of central opening portion, pin-and-hole 66b, directions X slotted hole 66c; Be provided with the ND light filter 67 of pin-and-hole 67b, directions X slotted hole 67c; With rivet pin 68.

The pin-and-hole 65a of one end of above-mentioned light filter actuating arm 65 embeds the drive pin 63a of light filter driven wheel 63, and is supported by light filter driven wheel 63 one.Above-mentioned rivet pin 68 is with the state of the pin-and-hole 66b of the pin-and-hole 67b that can embed above-mentioned ND light filter 67 rotationally and above-mentioned ND light filter antisitic defect sheet 66, by riveted and fixed in the pin-and-hole 65b of above-mentioned light filter actuating arm 65.The slotted hole 66c and the 67c of ND light filter antisitic defect sheet 66 and ND light filter 67 embed the directing pin 31e of 1 framing 31 with being free to slide, and are being supported by it.The peristome 32a side of the fixed frame 32 below ND light filter 67; disposing support chip 78 (Fig. 3, Fig. 4) with ND light filter screening glass 79; this ND light filter screening glass 79 has central opening portion; ND light filter 67 is configured on the plane vertical with optical axis O2, can slide at directions X along this plane and move.

Utilization has in the light quantity adjustment action that the ND filter elements 47 of said structure carries out, the ND light filter is driven to solenoid 51 and sees from Figure 10 below and to be when clockwise rotating, light filter actuating arm 65 is driven by light filter driven wheel 63, sees from Figure 10 below and is and clockwise rotates (ND light filter enter driving direction).ND light filter antisitic defect sheet 66 and ND light filter 67 one are to X (+) direction (axial plane that promptly comprises optical axis O1, optical axis O2, promptly vertical direction) slides with the YZ plane, ND light filter 67 moves to the in-position that covers peristome 32a from the position of the peristome 32a that avoids fixed frame 32, forms the state that the subject light quantity that has reduced incides 2 groups of lens 35 sides.Otherwise, the ND light filter is driven to solenoid 51 and sees from Figure 10 below and to be when rotating counterclockwise, ND light filter antisitic defect sheet 66 and ND light filter 67 slide to the opposite direction (X (-) direction) of above-mentioned moving direction, ND light filter 67 moves to the position of avoiding of the peristome 32a that avoids fixed frame 32, and the whole incident light quantities that form the subject light beam inject to the state of 2 groups of lens 35 sides.

As shown in figure 12, above-mentioned shutter unit 48 is mounted in the unit on 2 framings, 38 tops, has: be provided with the 73a of central opening portion, 4 supported hole 73b, withdraw from the shutter cover 73 with the backstop hole 73d of arc groove 73c, relative two zigzag parts; Being provided with the long guiding hole 74b that advances of directions X, the cooperation (Department of Z direction closes) hole promptly cooperates the 1st segment 74 of slotted hole 74c and shielding portion; Be provided with peristome 75a, the installation slotted hole 75b that is used to provide shutter aperture, the 1st blade 75 that withdraws from usefulness arc groove 75c; Be provided with the long guiding hole 76b that advances of directions X, the mating holes of Z direction promptly cooperates the 2nd segment 76 of slotted hole 76c and shielding portion; Be provided with diameter greater than the peristome 77a of above-mentioned peristome 75a, slotted hole 77b be installed, withdraw from the 2nd blade 77 with arc groove 77c; The segment driver part that be provided with rotation axial region 43a along the Y direction, be driven slotted hole 43b, two fitted shaft is segment drive pin 43c, 43d is a segment driving stem 43.

Respectively establish two installation slotted hole 75b, 77b on above-mentioned the 1st, the 2nd blade 75,77, a side separately is entrenched among the ladder pin 38b and positions, and the opposing party has a little gap.

Above-mentioned segment driving stem 43 makes it rotate the release lever rotational axis hole 38e that axial region 43a connects 2 framings 38, makes anticreep use back-up ring 45 backstops on this axial region top.Under the state that this segment driving stem 43 has been installed, insert the 2nd blade the 77, the 2nd segment the 76, the 1st blade the 75, the 1st segment 74 to the ladder pin 38b of 2 framings 38 from the upper side order of 2 framings 38.At this moment, make side's segment drive pin 43c of segment driving stem 43 insert logical withdrawing from proper order from the below with arc groove 77c, 75c and cooperation slotted hole 74c, make the opposing party's segment drive pin 43d insert wildcard simultaneously and close slotted hole 76c, go up shutter cover 73 from the top cover at last, backstop hole 73d is coupled on the 38f of stop projection portion of 2 framings 38, makes shutter unit 48 be in installment state.Under this state, above-mentioned segment drive pin 43c is inserted to lead to and is withdrawed from among the arc groove 73c.What the axial region 72 of shutter actuating arm 71 described later embedded above-mentioned segment driving stem 43 with being free to slide is driven slotted hole 43b, so segment driving stem 43 is driven by shutter actuating arm 71 and rotates, the segment 74,76 of above-mentioned shutter unit 48 is driven slides.

Above-mentioned axial region 72 is at the rotation axis center of leaving shutter actuating arm 71 to be the state of the position of predetermined distance to the direction extension parallel with optical axis O2, be fixedly connected on the shutter actuating arm 71, advance and retreat when mobile to optical axis O2 direction even its length is configured under assembled state 2 framings 38, axial region 72 also can be in the mated condition in the slotted hole 43b of being driven that embeds segment driving stem 43 always.

Amplification profile as above-mentioned shutter actuating arm and axial region is shown in Figure 14 (A), and above-mentioned axial region 72 is inserted into the axis hole 71a on the top of arm 71, embeds gap injection bonding agent to it and carries out fixed bonding.Shown in Figure 14 (B), when bonding above-mentioned shutter actuating arm 71 and axial region 72, shutter actuating arm 71 is installed on the maintenance framework 91a that is formed on the anchor clamps 91 that are adhesively fixed, makes axial region 72 embed the axle retaining hole 91b of anchor clamps 91 and by its maintenance, and insertion axis hole 71a.Above-mentioned axis hole 71a and axial region 72 have the gap that can adjust positional precision, and it is supported that axial region 72 leaves predetermined distance and parallel state with relative shutter actuating arm 71.Inject bonding agent to axis hole 71a under this holding state, axial region 72 is adhesively fixed on the shutter actuating arm 71.When shutter actuating arm 71 was assembled on the fixed frame 32, it is supported that above-mentioned axial region leaves predetermined distance and the state parallel with optical axis O2 with relative shutter actuating arm 71.

Above-mentioned shutter actuating arm 71 on the plane vertical with optical axis O2, be in roughly the same area with the 2nd stepper motor 54, but the 2nd stepper motor 54 is configured in the position of shaking track of avoiding axial region 72 under confined state.Simultaneously, above-mentioned parts 72 shakes the zone that track is positioned at the position of avoiding hanging axis 41.

The switching turned position of above-mentioned shutter actuating arm 71, promptly shown in Figure 11 as the C of Fig. 5 to view, stipulate by the restriction projection of the peristome 32g of fixed frame 32.Promptly, shutter actuating arm 71 is inserted the peristome 32g that has two restriction projection 32i, 32h in the logical fixed frame 32, shutter actuating arm 71 is when opening direction rotation (clockwise direction among Figure 11), and its top contact limits projection 32i, the open turned position of regulation shutter actuating arm 71.When shutter actuating arm 71 rotates (counter clockwise direction among Figure 11) to closing direction, its top contact restriction projection 32h, regulation shutter actuating arm 71 close the turned position.

Shutter unit 48 configuration and 2 framings, 38 one above 2 framings 38 move to optical axis O2 direction advance and retreat.Therefore, above-mentioned the 1st, 2 segments 74,76 are kept along the plane vertical with optical axis O2 always, and slide on this plane and move.

Shutter on-off action with shutter unit 48 of said structure, when the shutter close state shown in Figure 13 (B) becomes shutter open state shown in Figure 13 (A), rotate counterclockwise (on Figure 13 (B)) if drive shutter with the output shaft 52a of solenoid 52, the axial region 72 of segment driving stem 43 by shutter actuating arm 71 is driven and clockwise rotates.By clockwise rotating of segment driving stem 43, shown in Figure 13 (A), the 1st segment 74 is driven by segment drive pin 43c, 43d with the 2nd segment 76 and slides with X (-) direction (promptly vertical with the axial plane of optical axis O2 with comprising optical axis O1 direction) to X (+) direction respectively, forms the shutter open state (maximum diameter of hole) that makes the 75a of blade openings portion open.

When the shutter open state shown in Figure 13 (A) becomes the shutter close state, when driving shutter and clockwise rotating (on Figure 13 (A)) with the output shaft 52a of solenoid 52, the axial region 72 of segment driving stem 43 by shutter actuating arm 71 is driven and rotates counterclockwise.By rotating counterclockwise of segment driving stem 43, shown in Figure 13 (B), the 1st segment 74 is driven by segment drive pin 43c, 43d with the 2nd segment 76 and slides with X (+) direction (promptly vertical with the axial plane of optical axis O2 with comprising optical axis O1 direction) to X (-) direction respectively, forms the shutter close state that the 75a of blade openings portion is closed.

When assembling each component parts such as lens combination, stepper motor of above-mentioned lens drum 10, the peristome 32g of the rear side by being located at said fixing framework 32 carries out insertion, the assembling of said lens group, stepper motor etc.After assembling finishes, sheet metal fixed cap 89 is installed on above-mentioned peristome 32g, is made screw insert logical screw insertion hole 89d, 89e, and screw in fixed frame side screw hole 32d, 32e, make fixed frame 32 be air-tight state (Fig. 3).

As shown in figure 15, be provided with at the front side wall 32j of the fixed frame 32 of said lens tube 10 and can insert aforementioned 2,3 framing reset positions and detect patchhole 32r, 32s with PR58 and PR59, front side wall 32j is the 2nd outer wall along the face vertical with the thickness direction of fixed frame rectangular parallelepiped (XY plane).Detected relative position the when position of above-mentioned patchhole 32r and 32s is in the reset position that is positioned on the motion track with 2,3 framings 38,39.

As shown in figure 16, at the front side wall 32j of adjacency fixed frame 32, and, be provided with terminal inserting hole 32m, 32n along the i.e. upper and lower position of left side (right side among Figure 16) wall 32k of described the 1st outer wall of the face of rectangular parallelepiped thickness direction.Each of the 1st stepper motor 53 and the 2nd stepper motor 54 4 motor terminal 53d, 54d insert the sub-inserting hole 32m in go side, 32n, and are exposed to the fixed frame outside.The ND light filter is with 2 lead 51b of solenoid 51 and shutter 2 lead 52b with solenoid 52, keeps the left side (right side Figure 16) of framework 31 to be derived from the 1st as shown in figure 16, is directed into the top of front side wall 32j.

Upper portion at above-mentioned connection FPC86 is provided with the ND light filter with solenoid lead connection pads 86e and shutter solenoid lead connection pads 86f, at central part the above-mentioned PR58 of surface installing type, 59 is installed.The two projection 86a of place, 86b bending that connect FPC86 attached to from the surface of the front side wall 32j of fixed frame 32 to the surface of left side wall 32k.On this projection 86a, 86b, be provided with the 1st stepper motor terminal connection pads 86c and the 2nd stepper motor terminal connection pads 86d.

When being installed in above-mentioned connection on the lens drum 10 with FPC86, make to connect on the surface of FPC86 attached to the front side wall 32j of fixed frame 32, the PR58 that has installed, 59 is inserted patchhole 32r, the 32s of fixed frame 32 respectively.On the other hand, make the projection 86a, the 86b that connect FPC from the face side bending of the front side wall 32j of fixed frame 32 attached on the left side wall 32k, motor terminal 53d, 54d are welded on motor terminal connection pads 86c, the 86d.Lead 51b, the 52b of solenoid 51,52 are welded on solenoid lead connection pads 86e, the 86f that connects FPC86.This connects FPC86 is derived by the board side from aforementioned circuit board unit 5 sides, is connected with connector.

Below, the photography action of the camera 1 of the present embodiment with said structure is described.

The user comes the energized switch by the power knob 27 on the operation bonnet, and storage card 120 is inserted card slot 21.Operate not shown mode initialization button 27 then, carry out selection, the setting of photograph mode by CPU170.

Then, when photographing, the image of the subject light beam that obtains by 33,1～4 group of lens 34～37 of prism is converted into electric image pickup signal by CCD55 under the control of CPU170, deposited in internal memory 130 as vision signal.This vision signal is presented on the LCD display board 15 as shot object image.The user carries out subject and the photography field angle that operation such as zoom decision should be photographed, and when having carried out first grade of pressing operation of release-push 26, under the control of CPU170, according to the contrast information of above-mentioned picture signal, the focusing of carrying out 3 groups of lens 36 drives.This focusing drives and above-mentioned zoom drive is by drive controlling the 1st, the 2nd stepper motor 53,54,2 framings 38 and 3 framings 39 is moved to respectively carry out along the advance and retreat position of optical axis O2 separately.On the other hand, according to the above-mentioned vision signal of obtaining, carry out the photometry of object light.According to this photometric data, when subject brightness was higher than setting, driving N D light filter entered and moves to the position that covers fixed frame peristome 32a with solenoid 51, ND light filter 67.

Afterwards, second grade of pressing operation by release-push 26 obtains the photography commencing signal, through based on the shutter of above-mentioned photometric data after the open hour, the driving shutter moves to solenoid the 52, the 1, the 2nd segment 74,76 and closes the position, becomes the shutter close state.

In operating period, the subject light beam that obtains by prism 33 sees through Photographical lens system, images on the imaging surface of CCD55, and exposes at above-mentioned shutter.Under the control of CPU170,, and be converted into vision signal from the image pickup signal of CCD55 in the output time shutter.After above-mentioned vision signal is recorded in internal memory 130 for the time being, carry out predetermined process, and be recorded in the storage card 120, finish photography by image processing circuit 140.

If adopt the lens drum 10 of the camera that is built in present embodiment of above explanation, when at first carrying out the light quantity adjustment, the ND light filter 67 that makes the ND filter elements along directions X roughly (promptly, the direction vertical with the axial plane of optical axis O2 with comprising optical axis O1) slip is moved, so can make the thickness attenuation of the optical axis O1 direction (Z direction) of lens drum 10.

Equally, the segment 74,76 by making shutter unit is also slided to directions X roughly and is moved, can on-off shutter, make the thickness attenuation of the optical axis O1 direction (Z direction) of lens drum 10.

ND filter elements 47 is configured in different plane domain on the optical axis O2 direction with shutter unit 48.That is, ND filter elements 47 is configured in the following quadrate part of 1 framing, 31 sides, and shutter unit 48 is configured in the upward face of being located at 2 framings 38 that thereunder can advance and retreat.Therefore, the configuration of the optical axis O2 direction of lens drum is simplified, and can reduce the Y direction height of lens drum 10.

The ND light filter that is configured in prism 33 left sides of 1 framing 31 drives with solenoid 51 and segment driving and disposes side by side along optical axis O1 with solenoid 52, in addition, below this solenoid part, dispose the 1st, the 2nd stepper motor 53,54 that is used to drive 2,3 framings advance and retreat in the optical axis O2 left side of fixed frame 32.Promptly, side at the allocation position of shutter unit 48 and 2,3 framings 38,39, above-mentioned solenoid 51,52 of configuration and stepper motor 53,54 on the linearity region, left side parallel with optical axis O2 are so the dead-space volume (dead space) in the lens drum 10 becomes few.The bearing portion of stepper motor 53,54 and rotor portions are configured to respectively along optical axis O1 direction state arranged side by side, and be configured in the position of staggering mutually along optical axis O2 direction, be that guider screw axle 81 and 83 carries out high-efficient disposition with the state along optical axis O2 keeping parallelism so can make the output shaft of above-mentioned stepper motor.Therefore, the lens drum 10 whole compactnesses that become can realize miniaturization.

The axial region that shakes the end 72 that is fixed on shutter actuating arm 71 moves in the pivot region of avoiding hanging axis 41, and disposes the 2nd stepper motor outside the pivot region of this axial region, so from this point, also can make lens drum 10 become compact.

The axial region that shakes the end 72 that is fixed on shutter actuating arm 71 is provided in optical axis O2 direction and stretches out long given size, but form by tubular shaft.So the pericentral moment of inertia of the rotation axis of shutter actuating arm 71 can be not excessive, can fast driving the 1st, the 2nd segment 74,76 by above-mentioned axial region 72, can rapidly opened and closed shutter.

Below, use the planimetric map of the ND filter elements modified example of Figure 17, the modified example of the ND filter elements 47 that is applicable to said lens tube 10 is described.

The ND filter elements 101 of above-mentioned modified example has: ND light filter framework 102 that can slide mobile and the ND light filter 103 that is kept by ND light filter framework 102.

Above-mentioned ND light filter framework 102 has directions X for than the shape of length direction, is right-handly keeping above-mentioned ND light filter 103 at it.On ND light filter framework 102, form along the two side direction Z directions that clip ND light filter 103 and extend, and at stagger line channel 102b, the 102c of configuration and along the tooth bar 102d of a side Z side end face wherein of Z direction.

Embed pilot pin 31g, 31h in above-mentioned guide groove 102,102c, this pilot pin 31g, 31h are configured to separate and in position that directions X staggers along the Z direction in 1 framing, 31 sides with being free to slide.Above-mentioned tooth bar 102d and ND light filter mesh with the output pinion 61 of solenoid 51.

The ND light filter of above-mentioned ND filter elements 101 uses the output pinion 61 of solenoid 51 when the light filter approach axis rotates, ND light filter framework 102 to X (+) direction (promptly, the direction vertical with the axial plane of optical axis O2 with containing optical axis O2) slide, ND light filter 103 moves to the in-position that covers fixed frame peristome 32a.Otherwise when output pinion 61 was avoided the direction rotation to light filter, ND light filter framework 102 slided to X (-) direction, and ND light filter 103 moves to the position of avoiding fixed frame peristome 32a.

When using the ND filter elements 101 of above-mentioned modified example, can provide the component parts number that comprises driver part few, it is little to occupy the space, cheap and lens drum that can miniaturization.

According to aforesaid the present invention's 1,2,3 described lens drums, make the light quantity adjustment component to the structure that the direction with the axial plane approximate vertical that comprises the 1st optical axis and the 2nd optical axis moves by employing, can realize miniaturization, the slimming of lens drum.

The 4 described lens drums according to the present invention, the shutter unit that opens and closes the exposure peristome is set in the axial plane vertical with the 2nd optical axis, curtain-shaped cover member is moved to the direction with the axial plane approximate vertical that comprises the 1st optical axis and the 2nd optical axis, can realize miniaturization, the slimming of lens drum thus.

The 5 described lens drums according to the present invention, except that the effect of invention 4 described lens drums, dispose a plurality of actuating mechanisms that constitute with drive source with drive source and lens by shutter along direction with the 2nd optical axis almost parallel, and these actuating mechanisms are configured in the side of shutter unit, so can further realize miniaturization, the slimming of lens drum.

The 6 described lens drums according to the present invention except that the effect of invention 4 described lens drums, make the ND light filter to the structure that the direction with the axial plane approximate vertical that comprises the 1st optical axis and the 2nd optical axis moves by employing, can realize miniaturization, the slimming of lens drum.

The 7 described lens drums according to the present invention except that the effect of invention 6 described lens drums, are configured in ND light filter and shutter unit along the diverse location on the direction of the 2nd optical axis, so can further realize miniaturization, the slimming of lens drum.

8 described lens drums are the lens drums with variable-power optical system according to the present invention, along the 2nd optical axis configuration movable lens set, the shutter unit that opens and closes the exposure peristome is set in the plane vertical with the 2nd optical axis, and the curtain-shaped cover member of above-mentioned shutter unit is moved to the direction with the axial plane approximate vertical that comprises the 1st optical axis and the 2nd optical axis, can make the thickness attenuation of lens drum thus.

The 9 described lens drums according to the present invention except that the effect of invention 8 described lens drums, make the ND light filter to the structure that the direction with the axial plane approximate vertical that comprises the 1st optical axis and the 2nd optical axis moves by employing, can make the further attenuation of thickness of lens drum.

The 10 described lens drums according to the present invention, except that the effect of invention 9 described lens drums, dispose shutter drive source and light filter drive source side by side at the 1st optical axis direction, be configured to the 1st, the 2nd lens along the 1st optical axis arranged side by side with drive source, and, therefore can further realize miniaturization, the slimming of lens drum in the 2nd optical axis direction straight line position of staggering roughly.

Claims (1)

1. a lens drum has the variable-power optical system that is made of a plurality of lens combination, and this lens drum is characterised in that this lens drum possesses:

Reflection optics, it makes light beam along the 1st optical axis from subject incident along the 2nd optical axis reflection that intersects with above-mentioned the 1st optical axis;

The the 1st, the 2nd movable lens set along above-mentioned the 2nd optical axis configuration;

Keep above-mentioned the 1st movable lens set, make it can change the 1st movable framework that keeps of position along above-mentioned the 2nd optical axis;

Keep above-mentioned the 2nd movable lens set, make it can change the 2nd movable framework that keeps of position along above-mentioned the 2nd optical axis;

Shutter unit, it has curtain-shaped cover member, this curtain-shaped cover member changes the position integratedly along above-mentioned the 2nd optical axis and the above-mentioned the 1st movable framework that keeps, with the plane of above-mentioned the 2nd optical axis approximate vertical in, can move to position of covering the exposure opening and the position of opening this exposure opening, above-mentioned curtain-shaped cover member moves in the direction with the plane approximate vertical that comprises above-mentioned the 1st optical axis and above-mentioned the 2nd optical axis;

The ND light filter, this ND light filter is in the plane vertical with above-mentioned the 2nd optical axis, can move to position that enters in the light path of photography and the position of avoiding light path of photography, this ND light filter moves in the direction with the plane approximate vertical that comprises above-mentioned the 1st optical axis and the 2nd optical axis;

Drive the shutter drive source of above-mentioned curtain-shaped cover member;

Drive the light filter drive source of above-mentioned ND light filter; With

Make the above-mentioned the 1st movable framework and the 2nd movable lens driving unit that keeps framework along the 2nd optical axis change position of keeping,

Wherein, above-mentioned shutter disposes at the 1st optical axis direction with drive source side by side with drive source and above-mentioned light filter, the said lens driver element have the 1st optical axis direction side by side configuration, drive the above-mentioned the 1st, the 2nd movable two axles that keep framework respectively, and these two axles be configured in above-mentioned relatively shutter with drive source and light filter with drive source in the 2nd optical axis direction straight line position of staggering roughly

And wherein, above-mentioned two axles rotate together when zoom drive, drive the above-mentioned the 2nd movable axle rotation that keeps framework when focusing on action.

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