CN103389556B - Lens device - Google Patents

Lens device Download PDF

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Publication number
CN103389556B
CN103389556B CN201310168472.3A CN201310168472A CN103389556B CN 103389556 B CN103389556 B CN 103389556B CN 201310168472 A CN201310168472 A CN 201310168472A CN 103389556 B CN103389556 B CN 103389556B
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CN
China
Prior art keywords
lens
described
lens frame
1st
frame
Prior art date
Application number
CN201310168472.3A
Other languages
Chinese (zh)
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CN103389556A (en
Inventor
小山贵裕
高木裕基
高桥敬太
Original Assignee
奥林巴斯映像株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2012-106220 priority Critical
Priority to JP2012106220A priority patent/JP6027766B2/en
Priority to JP2012-128323 priority
Priority to JP2012128323A priority patent/JP6009826B2/en
Application filed by 奥林巴斯映像株式会社 filed Critical 奥林巴斯映像株式会社
Publication of CN103389556A publication Critical patent/CN103389556A/en
Application granted granted Critical
Publication of CN103389556B publication Critical patent/CN103389556B/en

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Abstract

Provided is a lens device which does not have special requirements on temperatures of usage environments and can prevent dew formation on a lens. The lens device (300) is connected with a pick-up device in a free assemble-and-disassemble manner, wherein the pick-up device shoots an object to generate image data of the object. The lens device (300) has a lens frame (310) which enables the optical axes of plural lenses to have the plural lenses accommodated and fixed in the internal part, a first lens (320) which is fixed at one end of the lens frame (310), a second lens (330) which is fixed at the central part of the optical axis direction of the lens frame (310), and a third lens (340) which is fixed at the other end of the lens frame (310). The lens frame (310) has a connection hole (318) for connecting a first room (K1) and a second room (K2), the ratio of the superficial area of the outer surface of the lens frame (310) to the volume of the lens frame (310) is larger than 4.

Description

Lens assembly

Technical field

The present invention relates to can relative to making a video recording to subject and generating the camera head disassembled and assembled freely of the view data of this subject, and from the lens assembly of predetermined area of visual field optically focused.

Background technology

In recent years, in the camera head such as digital camera or Digital Video, knownly can be arranged on lens barrel, and the first-class lens assembly of conversion mirror (with reference to patent documentation 1) of photographing can be carried out compared to the focal length of built-in optical system in wide-angle side.In the art, lens more than two panels are accommodated in lens frame, between adjacent lens, fill nitrogen etc.

Prior art document

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 2011-221300 publication

Summary of the invention

The problem that invention will solve

But there are the following problems in above-mentioned lens assembly: according to the temperature of environment for use, the moisture comprised in the inside of lens frame becomes state of saturation, produces condensation thus on lens.

The present invention completes just in view of the above problems, its object is to, and provides a kind of and can have nothing to do in the temperature of environment for use, prevents the lens assembly producing condensation on lens.

For the means of dealing with problems

In order to solve above-mentioned problem and reach object, lens assembly of the present invention with subject is made a video recording and the camera head that generates the view data of this subject can the mode of disassembled and assembled freely be connected, the feature of this lens assembly is, have: lens frame, it makes the optical axis of multiple lens as one man be received in internal arrangement by the plurality of lens and fix; 1st lens, it is fixed in one end of described lens frame; 2nd lens, it is fixed at the pars intermedia of the optical axis direction of described lens frame; And the 3rd lens, it is fixed at the other end of described lens frame, described lens frame has the connecting hole in connection the 1st space and the 2nd space, 1st space is formed between described 1st lens and described 2nd lens, 2nd space is formed between described 2nd lens and described 3rd lens, and the value obtained divided by the volume of this lens frame by the surface area of the outside surface of this lens frame is more than 4.

In addition, lens assembly of the present invention in the present invention as stated above, is characterized in that, has: the 1st filling component, and it is circular, is located between described 1st lens and described lens frame, fills the gap between described 1st lens and described lens frame; 2nd filling component, it is circular, is located between described 3rd lens and described lens frame, fills the gap between described 3rd lens and described lens frame; 1st fixed part, they are between described 1st lens and described lens frame, and the other end direction of described 1st lens to described lens frame is pressed and be fixed relative to described lens frame; And the 2nd fixed part, they are between described 3rd lens and described lens frame, are fixed to an extreme direction pressing of described lens frame by described 3rd lens relative to described lens frame.

In addition, lens assembly of the present invention in the present invention as stated above, is characterized in that, described lens frame is circular cone shape, and this frustum of a cone has the inclined-plane bent projectedly to inner circumferential side.

In addition, lens assembly of the present invention in the present invention as stated above, is characterized in that, the surface that described 1st lens expose from described lens frame is formed as plane, and the surface that described 3rd lens expose from described lens frame is formed as plane.

In addition, lens assembly of the present invention in the present invention as stated above, is characterized in that, this lens assembly is wide-angle breakout box.

The effect of invention

Lens assembly of the present invention is formed as, lens frame has the connecting hole in connection the 1st space and the 2nd space, 1st space is formed between the 1st lens and the 2nd lens, 2nd space is formed between the 2nd lens and the 3rd lens, and the value obtained divided by the volume of lens frame by the surface area of the outside surface of lens frame is more than 4.Produce following effect thus: can have nothing to do in the temperature of environment for use, prevent from producing condensation in the 1st lens.

Accompanying drawing explanation

Fig. 1 observes from front face side to have installed the lens assembly of embodiments of the present invention 1 and the stereographic map of the outward appearance of camera system that obtains at camera head.

Fig. 2 has installed the lens assembly of embodiments of the present invention 1 and the side view of the camera system obtained on camera head.

Fig. 3 has installed the lens assembly of embodiments of the present invention 1 and the rear view of the camera system obtained on camera head.

Fig. 4 is the A-A line cut-open view of Fig. 1.

Fig. 5 is the front view from front face side sight glass head lens barrel unit.

Fig. 6 is the B-B line cut-open view of Fig. 5.

Fig. 7 is the cut-open view of the lens assembly of embodiments of the present invention 1.

Fig. 8 is the cut-open view of the lens assembly of embodiments of the present invention 2.

Fig. 9 is the cut-open view of the lens assembly of the variation 1 of embodiments of the present invention 2.

Figure 10 is the cut-open view of the lens assembly of the variation 2 of embodiments of the present invention 2.

Figure 11 is the cut-open view of the lens assembly of embodiments of the present invention 3.

Figure 12 is the cut-open view of the lens assembly of embodiments of the present invention 4.

Figure 13 is the figure of the parameter of the lens frame that various embodiments of the present invention and each comparative example are shown.

Figure 14 is the figure of the analysis result of the temperature that various embodiments of the present invention and each comparative example are shown.

Figure 15 is the cut-open view of the lens assembly of comparative example 1 of the present invention.

Figure 16 is the cut-open view of the lens assembly of comparative example 2 of the present invention.

Label declaration

1: camera system

100: camera head

101: installing ring

110: housing

120: camera control substrate:

130: lens barrel unit

200: adapter apparatus

201: rear side camera lens installing ring

202: groove portion

300,400,420,430,500,600,700,800: lens assembly

301,401,501,601: jut

310,410,421,431,510,610,710,810: lens frame

310a, 410a, 42la, 43la, 510a, 610a, 710a, 810a: base end part

310b, 410b, 421b, 431b, 510b, 610b, 710b, 810b: tapering

310c, 410c, 421c, 431c, 510c, 610c, 710c, 810c: leading section

311,411,511,611: the 1 fixed parts

312,412,512,612: the 2 fixed parts

313,413,513,613: the 3 fixed parts

314,414,514,614: the 4 fixed parts

315,415,515,615: the 5 fixed parts

316,416,516,616: the 6 fixed parts

317,417,517,617: the 7 fixed parts

318,418,518,618: connecting hole

319,701,819: dip plane

320: the 1 lens

330: the 2 lens

340: the 3 lens

350: the 1 press pressure ring

360: the 2 press pressure ring

370: the 1O rings

380: the 2O rings

K1: the 1 space

K2: the 2 space

Embodiment

Be described for implementing mode of the present invention (hereinafter referred to as " embodiment ") referring to accompanying drawing.In addition, the invention is not restricted to this embodiment.In addition, in the record of accompanying drawing, identical label is marked to identical part.In addition, accompanying drawing is schematic, should be noted that the relation of thickness from width of each parts, the ratio of each parts etc. are different with reality.In addition, between each accompanying drawing, also comprise size each other or the different part of ratio.

(embodiment 1)

Fig. 1 is the stereographic map observing the lens assembly having installed embodiments of the present invention 1 camera head and the outward appearance of camera system obtained from front face side.Fig. 2 has installed the lens assembly of embodiments of the present invention 1 and the side view of the camera system obtained in camera head.Fig. 3 has installed the lens assembly of embodiments of the present invention 1 and the rear view of the camera system obtained in camera head.Fig. 4 is the A-A line cut-open view of Fig. 1.In addition, in Fig. 1 ~ Fig. 4, as the intrinsic coordinate system of camera head, using the Width of camera head as the thickness direction of X-axis, camera head as Y-axis, the vertical direction of camera head is as Z axis.In addition, in Fig. 1 ~ Fig. 4, object side is described as front side, cameraman (back side) side as rear side.

Camera system 1 shown in Fig. 1 ~ Fig. 4 has: camera head 100, and it is made a video recording to subject, generates the view data of this subject; Adapter apparatus 200, it is arranged on camera head 100 in the mode of detachable; And lens assembly 300, it is arranged on camera head 100 in the mode of detachable via adapter apparatus 200.Be combined with the installing ring 101 of the front side being located at camera head 100 by the rear side camera lens installing ring 201 of the rear side by being located at adapter apparatus 200, thus adapter apparatus 200 is arranged on camera head 100.Chimeric with the groove portion 202 of the front side being located at adapter apparatus 200 by the jut 301 of the rear side by being located at lens assembly 300, thus lens assembly 300 is arranged on adapter apparatus 200.Thus, camera head 100, adapter apparatus 200 and lens assembly 300 are connected to one.In addition, above-mentioned installing ring is such as bayonet type.

First, the structure of camera head 100 is described.Camera head 100 has: the housing 110 being the roughly box shape of Nogata body; To be accommodated in housing 110 and camera head 100 to be carried out to the camera control substrate 120 of various control; And there is the lens barrel unit 130 of the bending optical system for making a video recording to subject.

Housing 110 have be formed as covering before, two sides, above and the front cover parts 111 of bottom surface, and be formed as the rear cover cabinet joint parts 112 covering rear side.Front cover parts 111 and rear cover cabinet joint parts 112 combine under state respect to one another, and housing 110 is formed as the box shape of the roughly Nogata body in inside with space thus.

Be provided with in front cover parts 111: photography window component 111a, it is for making object beam incident to the lens barrel unit 130 be built in housing 110; And illuminating window portion 111b, it makes the light outgoing of flashlamp light-emitting device (not shown).In addition, be provided with at the upper surface of front cover parts 111: power switch 111c, the electrical source exchange of camera head 100 is become on-state or off-state by it; And release-push 111d, it indicates photographing actions to camera head 100.

Below, cover 112 is provided with: the operating switch portion 112a that photograph mode or actions menu etc. are set; To the Zoom switch portion 112b that the zoom ratio of camera head 100 changes; By liquid crystal or organic EL(Electro Luminescence: electroluminescence) display panel that forms forms and shows the display part 112c of the image corresponding with view data; Prevent because external force produces the display window portion 112d impacted at display part 112c.

Camera control substrate 120 uses printed base plate and forms.Camera control substrate 120 has been installed on printed base plate: carry out the instruction corresponding with forming each portion of camera head 100 or data transmission etc. and control the CPU(Central Processing Unit of the action of camera head 100 blanketly: CPU (central processing unit)), control the flashlamp light emitting control of flash unit, view data is carried out to the image processing part (image processing engine) of image procossing, recording control part and the shaking detection sensor of view data is write in the recording mediums such as storage card.

Lens barrel unit 130, from predetermined area of visual field optically focused, receives the light of convergence and carries out opto-electronic conversion thus image data generating.At this, the structure of lens barrel unit 130 is described.Fig. 5 is the front view from front face side sight glass head lens barrel unit 130.Fig. 6 is the B-B line cut-open view of Fig. 5.In addition, in figure 6, left side is front face side, and right side is rear side.

As shown in Figure 5 and Figure 6, lens barrel unit 130 has: from the optical system 131 of predetermined area of visual field optically focused; The light that receiving optics 131 is assembled also carries out opto-electronic conversion thus the image unit 132 of image data generating; The lens frame 133 of storage optical system 131 and image unit 132; And relax external force to the damper elements 134 of the impact that lens frame 133 applies.

Optical system 131 is configured to bending optical system (flexing optical system), make to bend to X-direction approximate right angle from the object beam of the photography window component 111a incidence be located at front cover parts 111 by optical element 131a, the bottom surface of lens barrel unit 130 is configured with in the image unit 132 of sensitive surface and imaging is carried out to shot object image.In addition, in present embodiment 1, so that right-angle prism is described as optical element 131a, but such as also can be made up of variable mirror or lens etc.In addition, in the following description, object beam transmitting lens head unit 300 and photography window component 111a being incident to lens barrel unit 130 is set to the 1st optical axis L 1, and the light beam after bending being made the 1st optical axis L 1 by optical element 131a is set to the 2nd optical axis L 2.

The detailed construction of optical system 131 is described.Optical system 131 has from the light incident side of object beam incidence successively towards becoming image side: have optical element 131a(reflection part) the 1st lens combination G1 of negative refractive power; Be configured in the 2nd lens combination G2 of the positive refractive power in the 2nd optical axis L 2; Be configured in the 3rd lens combination G3 of the negative refractive power in the 2nd optical axis L 2; Be configured between the 2nd lens combination G2 and the 3rd lens combination G3, and the state of image unit 132 is set to the shutter 131b of exposure status or shading status; And be configured in the 4th lens combination G4 of the positive refractive power in the 2nd optical axis L 2.

1st lens combination G1 uses double-concave negative lens r11, optical element 131a, forms convex surface facing the positive concave-convex lens r12 of object side.1st lens combination G1 is configured with double-concave negative lens r11, optical element 131a and positive concave-convex lens r12 along the 1st optical axis L 1 and the 2nd optical axis L 2 successively from object side device.2nd lens combination G2 uses biconvex lens r21, the positive concave-convex lens r22 convex surface facing object side, cemented lens r23, the biconvex positive lens r24 convex surface facing the negative meniscus lens of object side are formed.2nd lens combination G2 is configured with biconvex lens r21, positive concave-convex lens r22, cemented lens r23 and biconvex positive lens r24 successively along the 2nd optical axis L 2 from object side.3rd lens combination G3 uses and forms convex surface facing the negative meniscus lens r31 of object side.4th lens combination G4 uses biconvex positive lens r41 and forms.

Image unit 132 is configured in the bottom of lens barrel unit 130, the below of optical system 131.Image unit 132 has light that receiving optics 131 assembles and carries out opto-electronic conversion thus the imaging apparatus 132a of image data generating, keep the imaging apparatus frame 132b of imaging apparatus 132a, be arranged on the optical low-pass filter 132c before imaging apparatus 132a and installed the flexible printed board 132d of imaging apparatus 132a.Imaging apparatus 132a uses CCD(Charge Coupled Device:: charge coupled cell) or CMOS(Complementary MetalOxide Semiconductor: complementary metal oxide semiconductor (CMOS)) etc. and form.Imaging apparatus frame 132b by the displacement two-dimensionally in the XY plane orthogonal with optical axis L 2 of not shown drive unit, thus plays a role as shake correction unit.

Lens frame 133 has the 1st fixed frame 133a of maintenance the 1st lens combination G1, and keeps the 2nd fixed frame 133b of the 2nd lens combination G2, the 3rd lens combination G3, shutter 131b and the 4th lens combination G4.1st fixed frame 133a is fixed on the 2nd fixed frame 133b by multiple screw part.

2nd fixed frame 133b has the 4th frame 133e of the 2nd frame 133c of maintenance the 2nd lens combination G2, the 3rd frame 133d keeping the 3rd lens combination G3 and maintenance the 4th lens combination G4.2nd frame 133c, the 3rd frame 133d and the 4th frame 133e are maintained in lens frame 133 in the mode can retreated along the 2nd optical axis L 2.2nd frame 133c, the 3rd frame 133d and the 4th frame 133e are moved up the 2nd optical axis L 2 side by the driving mechanisms such as stepper motor (not shown).Camera head 100 makes the 4th lens combination G4 retreat mobile along the 2nd optical axis L 2 when carrying out focus operation via the 4th frame 133e, can take focus thus and be registered to image in subject.In addition, camera head 100 drives driving mechanism (not shown) when carrying out zoom action, the 2nd lens combination G2 of the 2nd frame 133c and the 3rd lens combination G3 of the 3rd frame 133d is retreated along the 2nd optical axis L 2 mobile, thus change the multiplying power of the optical zoom from wide-angle side to telescope end.

Return Fig. 1 ~ Fig. 4, adapter apparatus 200 is described.Adapter apparatus 200, in circular, has rear side camera lens installing ring 201 and groove portion 202.A part for the inner face in groove portion 202 implements screw chasing.Thus, adapter apparatus 200 dismounting can install lens assembly 300 described later freely.

Then, lens assembly 300 is described.Fig. 7 is the cut-open view of lens assembly 300.In addition, in the figure 7, left side is described as front side, right side as rear side.

Lens assembly 300 shown in Fig. 7 has lens frame 310, the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st by pressure ring 350, the 2nd by pressure ring 360,1O ring 370 and 2O ring 380, and described lens frame 310 is provided with for making the optical axis of multiple lens as one man be received and the structure of fixing in internal arrangement by multiple lens.

Lens frame 310 is such as 137W/(mk by the pyroconductivity that aluminium is such) metal, high-termal conductivity globular graphite or containing more than the synthetic resin (such as polyphenylene sulfide (PPS) resin 2W/(mk) of carbon fiber) etc. form.Lens frame 310, in the roughly frustum of a cone (taper) diminished from front side towards rear side diameter, is the space of the roughly frustum of a cone in inside formation.Specifically, lens frame 310 has in circular base end part 310a, is formed with in the mode expanded from rear side diametrically outer circumferential side toward the front side the tapering 310b of the dip plane bent projectedly to inner circumferential side and is circular leading section 310c.The mode that lens frame 310 connects continuously with base end part 310a, tapering 310b and leading section 310c forms.The ratio of volume and surface area that lens frame 310 is formed as lens frame 310 meets predetermined condition.Specifically, lens frame 310 is formed as meeting the value obtained divided by the volume of lens frame 310 by the surface area of the outside surface of lens frame 310 is more than 4.

In addition, be provided with at the inner face of lens frame 310: the 1st fixed part 311 fixing the 1st lens 320, the 2nd fixed part 312 fixing the 2nd lens 330, fix the 3rd lens 340 the 3rd fixed part 313, fix 1O ring 370 the 4th fixed part 314, fix the 1st by pressure ring 350 the 5th fixed part 315, fix 2O ring 380 the 6th fixed part 316 and fix the 2nd by the 7th fixed part 317 of pressure ring 360.The diameter that 1st fixed part the 311 ~ 7th fixed part 317 is respective and the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st are formed by the external diameter of pressure ring 360,1O ring 370 and 2O ring 380 accordingly by pressure ring 350, the 2nd.Such as, the diameter that the 1st fixed part 311 is formed as its inner face is roughly consistent with the external diameter of the 1st lens 320, and cross section is substantially C-shaped.In addition, be provided with multiple connecting hole 318 at the 2nd fixed part 312, it connects the 1st space K1 and the 2nd space K2, and wherein the 1st space K1 is formed between the 1st lens 320 and the 2nd lens 330, and the 2nd space K2 is formed between the 2nd lens 330 and the 3rd lens 340.

In addition, the outside surface of the tapering 310b in lens frame 310 is provided with and implements R processing and the dip plane 319 bending smoothly that obtains, and the jut 301 chimeric with the groove portion 202 of adapter apparatus 200.The outside surface of jut 301 implements screw chasing.

1st lens 320 use such as pyroconductivity for 0.85W/(mk) glass etc. and form.1st lens 320 are that to use be plane from the face that lens frame 310 is exposed, and another face is that the negative lens of concave surface is formed.1st lens 320 are supported by the stationary plane 31la of the 1st fixed part 311 and are fixed.In addition, be formed in the 1st lens 320 in circular and keep the groove portion 320a of 1O ring 370.

2nd lens 330 use pyroconductivity to be 0.90W/(mk) glass etc. and form.2nd lens 330 are use faces is plane, and another face is that the negative lens of concave surface is formed.2nd lens 330 are supported by the stationary plane 312a of the 2nd fixed part 312 and are fixed.

3rd lens 340 use pyroconductivity to be 1.02W/(mk) glass etc. and form.3rd lens 340 are that to use be plane from the face that lens frame 310 is exposed, and another face is that the positive lens of convex surface is formed.3rd lens 340 are supported by the stationary plane 313a of the 3rd fixed part 313 and are fixed.In addition, be formed in the 3rd lens 340 in circular and keep the groove portion 340a of 2O ring 370.

1st is such as 137W/(mk by pyroconductivity by pressure ring 350) the such metal of aluminium or high-termal conductivity globular graphite or containing more than the synthetic resin (such as polyphenylene sulfide (PPS) resin 2W/(mk) of carbon fiber) etc. form, in circular.1st has from the interior jut 350a facing to umbo by pressure ring 350.1st presses pressure ring 350 between the 1st lens 320 and lens frame 310, and the rear side (other end direction) of the 1st lens 320 to lens frame 310 is pressed and fixed relative to lens frame 310.Specifically, the 1st by the jut 350a of pressure ring 350, the rear side of the 1st lens 320 to lens frame 310 is pressed and fix relative to lens frame 310.In addition, in present embodiment 1, the 1st plays a role as the 1st fixed part by pressure ring 350.

2nd is such as 137W/(mk by pyroconductivity by pressure ring 360) the such metal of aluminium or high-termal conductivity globular graphite or containing more than the synthetic resin (such as polyphenylene sulfide (PPS) resin 2W/(mk) of carbon fiber) etc. form, in circular.2nd to have by pressure ring 360 and is formed as circular jut 360a from a face.2nd presses pressure ring 360 between the 3rd lens 340 and lens frame 310, and the front side (extreme direction) of the 3rd lens 340 to lens frame 310 is pressed and fixed relative to lens frame 310.Specifically, the 2nd by the jut 360a of pressure ring 360, the front side of the 3rd lens 340 to lens frame 310 is pressed and fix relative to lens frame 310.In addition, in present embodiment 1, the 2nd plays a role as the 2nd fixed part by pressure ring 360.

1O ring 370 as seal member uses the pyroconductivities such as the ethylene/propene/ethylene-propylene-diene rubber (EPDM) of high-termal conductivity to be 0.36W/(mk) resin form, in circular.1O ring 370 is located between the 1st lens 320 and lens frame 310, fills the gap between the 1st lens 320 and lens frame 310.In addition, in present embodiment 1,1O ring 370 plays a role as the 1st filling component.

2O ring 380 as seal member uses the pyroconductivities such as the ethylene/propene/ethylene-propylene-diene rubber (EPDM) of high-termal conductivity to be 0.36W/(mk) resin form, in circular.2O ring 380, between the 3rd lens 340 and lens frame 310, fills the gap between the 3rd lens 340 and lens frame 310.In addition, in present embodiment 1,2O ring 380 plays a role as the 2nd filling component.

In the lens assembly 300 formed like this, first, with bonding agent, the 2nd lens 330 are fixed on the 2nd fixed part 312 of lens frame 310, then, with bonding agent, the 1st lens 320 are fixed on the 1st fixed part 311 of lens frame 310.Then, 1O ring 370 is inserted the 4th fixed part 314 and groove portion 320a, be then fixed with bonding agent.Then, be fixed on the 5th fixed part 315 by the 1st by pressure ring 350 and under the state being pressed the front side of the 1st lens 320 by jut 350a, be fixed in lens frame 310 with screw (not shown) etc.

Then, the 3rd lens 340 are inserted into lens frame 310 from rear side, are fixed on the 3rd fixed part 313 with bonding agent.Then, 2O ring 380 is inserted in lens frame 310, and is inserted in the 6th fixed part 316 and groove portion 340a, be then fixed with bonding agent.Then, be fixed to the 7th fixed part 317 by the 2nd by pressure ring 360 and under the state being pressed the rear side of the 3rd lens 340 by jut 360a, be fixed in lens frame 310 with screw (not shown) etc.Thus, the inside of lens frame 310 becomes watertight state, can anti-sealing etc. immerse from outside.In addition, the 1st lens 320 and the 3rd lens 340 be formed as plane from the face that lens frame 310 is exposed, therefore, it is possible to prevent the scar etc. that external force causes.In addition, lens assembly 300 plays a role as wide-angle conversion lens.

The lens assembly 300 of embodiments of the present invention 1 described above is formed as having connecting hole 318, when lens frame 310 receives the 1st lens 320, the 2nd lens 330 and the 3rd lens 340 successively respectively from object side, this connect apertures 318 connects the 1st space K1 and the 2nd space K2, the value obtained divided by the volume of lens frame 310 by the surface area of the outside surface of lens frame 310 is more than 4, therefore, can have nothing to do in the temperature of environment for use, prevent from producing condensation in the 1st lens 320.

(embodiment 2)

Then, embodiments of the present invention 2 are described.The lens assembly of present embodiment 2 and the difference of above-mentioned embodiment are only the shape of lens frame.Therefore, only the structure of the lens assembly of present embodiment 2 is described below.In addition, mark identical label to the structure identical with above-mentioned embodiment 1 to be described.

Fig. 8 is the cut-open view of the lens assembly of present embodiment 2.In addition, in fig. 8 left side is described as front side, right side as rear side.

Lens assembly 400 shown in Fig. 8 has lens frame 410, the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st by pressure ring 350, the 2nd by pressure ring 360,1O ring 370 and 2O ring 380, and described lens frame 410 is provided with for making the optical axis of multiple lens as one man be received and the structure of fixing in internal arrangement by multiple lens.

Lens frame 410, in the roughly frustum of a cone diminished from front side towards rear side diameter, is formed with the space in the roughly frustum of a cone in inside.Specifically, lens frame 410 has: be formed in circular base end part 410a, in the mode expanded from rear side diametrically outer circumferential side toward the front side the dip plane bent projectedly to inner circumferential side tapering 410b and in circular leading section 410c.The mode that lens frame 410 connects continuously with base end part 410a, tapering 410b and leading section 410c forms.Lens frame 410 is formed by stainless steel and resin or compound substance such as ABS resin etc.The ratio of volume and surface area that lens frame 410 is formed as lens frame 410 meets predetermined condition.Specifically, lens frame 410 is formed as meeting the value obtained divided by the volume of lens frame 410 by the surface area of the outside surface of lens frame 410 is more than 4.

In addition, be provided with at the inner face of lens frame 410: the 1st fixed part 411 fixing the 1st lens 320, the 2nd fixed part 412 fixing the 2nd lens 330, fix the 3rd lens 340 the 3rd fixed part 413, fix 1O ring 370 the 4th fixed part 414, fix the 1st by pressure ring 350 the 5th fixed part 415, fix 2O ring 380 the 6th fixed part 416 and fix the 2nd by the 7th fixed part 417 of pressure ring 360.The diameter that 1st fixed part the 411 ~ 7th fixed part 417 is respective and the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st are formed by the external diameter of pressure ring 360,1O ring 370 and 2O ring 380 accordingly by pressure ring 350, the 2nd.In addition, the 2nd fixed part 412 is provided with the connecting hole 418 of multiple connection the 1st space K1 and the 2nd space K2.

In addition, the outside surface of lens frame 410 is provided with the dip plane 419 and the jut 401 chimeric with the groove portion 202 of adapter apparatus 200 that bend with level and smooth angle.Screw chasing is implemented at the outside surface of jut 401.Concavo-convex processing is implemented on the whole at the outside surface of lens frame 410 of the dip plane 419 comprising tapering 410b.Thus, surface area increase compared with volume of lens frame 410, pyroconductivity is excellent.

In embodiments of the present invention 2 described above, lens frame 410 has connecting hole 418, when lens frame 410 receives the 1st lens 320, the 2nd lens 330 and the 3rd lens 340 successively respectively from object side, this connecting hole 418 connects the 1st space K1 and the 2nd space K2, the value being formed as the surface area of the outside surface of lens frame 410 to obtain divided by the volume of lens frame 410 is more than 4, therefore, it is possible to have nothing to do in the temperature of environment for use, prevent from producing condensation on the 1st lens 320.

(variation 1 of embodiment 2)

In embodiments of the present invention 2, implement concavo-convex processing on the whole at the outside surface of lens frame 410, but also only can implement concavo-convex processing in a part for lens frame 410.Fig. 9 is the cut-open view of the lens assembly of the variation 1 of present embodiment 2.Lens assembly 420 shown in Fig. 9 has lens frame 421.Lens frame 421, in the roughly frustum of a cone diminished from front side towards rear side diameter, is formed with the space in the roughly frustum of a cone in inside.Specifically, lens frame 421 has: be formed in circular base end part 421a, in the mode expanded from rear side diametrically outer circumferential side toward the front side the dip plane tilted projectedly to inner circumferential side tapering 421b and in circular leading section 421c.The mode that lens frame 421 connects continuously with base end part 421a, tapering 421b and leading section 421c forms.In addition, a part for the outside surface of tapering 421b implements concavo-convex processing.Specifically, the concavo-convex processing implemented at the outside surface of tapering 421b is that the outside surface between the 2nd lens 330 and the 3rd lens 340 is implemented.Thus, surface area increase compared with volume of lens frame 421, pyroconductivity is excellent.

(variation 2 of embodiment 2)

Figure 10 is the cut-open view of the lens assembly of the variation 2 of present embodiment 2.Lens assembly 430 shown in Figure 10 has lens frame 431.Lens frame 431, in the roughly frustum of a cone diminished from front side towards rear side diameter, is formed with the space in the roughly frustum of a cone in inside.Specifically, lens frame 431 has: be formed in circular base end part 431a, in the mode expanded from rear side diametrically outer circumferential side toward the front side the dip plane bent projectedly to inner circumferential side tapering 431b and in circular leading section 431c.The mode that lens frame 431 connects continuously with base end part 431a, tapering 431b and leading section 431c forms.In addition, concavo-convex processing is implemented at the outside surface of tapering 431b.Thus, surface area increase compared with volume of lens frame 431, pyroconductivity is excellent.

(embodiment 3)

Then, embodiments of the present invention 3 are described.The lens assembly of present embodiment 3 and the difference of above-mentioned embodiment are only the shape of lens frame.Therefore, only the structure of the lens assembly of present embodiment 3 is described below.In addition, identical to the embodiment 1 with above-mentioned structure marks identical label and is described.

Figure 11 is the cut-open view of the lens assembly of present embodiment 3.In addition, in fig. 11 left side is described as front side, right side as rear side.

Lens assembly 500 shown in Figure 11 has lens frame 510, the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st by pressure ring 350, the 2nd by pressure ring 360,1O ring 370 and 2O ring 380, and described lens frame 510 is provided with for making the optical axis of multiple lens as one man be received and the structure of fixing in internal arrangement by multiple lens.

Lens frame 510, in the roughly frustum of a cone diminished from front side towards rear side diameter, is formed with the space in the roughly frustum of a cone in inside.Specifically, lens frame 510 has: be formed in circular base end part 510a, in the mode expanded from rear side diametrically outer circumferential side toward the front side the dip plane bent projectedly to inner circumferential side tapering 510b and in circular leading section 510c.The mode that lens frame 510 connects continuously with base end part 510a, tapering 510b and leading section 510c forms.Lens frame 510 is formed by stainless steel and resin or compound substance such as ABS resin etc.The ratio of volume and surface area that lens frame 510 is formed as lens frame 510 meets predetermined condition.Specifically, lens frame 510 is formed as meeting the value obtained divided by the volume of lens frame 510 by the surface area of the outside surface of lens frame 510 is more than 4.

In addition, be provided with at the inner face of lens frame 510: the 1st fixed part 511 fixing the 1st lens 320, the 2nd fixed part 512 fixing the 2nd lens 330, fix the 3rd lens 340 the 3rd fixed part 513, fix 1O ring 370 the 4th fixed part 514, fix the 1st by pressure ring 350 the 5th fixed part 515, fix 2O ring 380 the 6th fixed part 516 and fix the 2nd by the 7th fixed part 517 of pressure ring 360.The diameter that 1st fixed part the 511 ~ 7th fixed part 517 is respective and the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st are formed by the external diameter of pressure ring 360,1O ring 370 and 2O ring 380 accordingly by pressure ring 350, the 2nd.In addition, the 2nd fixed part 512 is provided with the connecting hole 518 of multiple connection the 1st space K1 and the 2nd space K2.

In addition, the outside surface of lens frame 510 is provided with the dip plane 519 of level and smooth angular slope and the jut 501 chimeric with the groove portion 202 of adapter apparatus 200.Screw chasing is implemented at the outside surface of jut 501.In addition, the dip plane 519 of tapering 510b is formed thinner compared with other side.Thus, the surface area of lens frame 510 increase compared with volume.

In embodiments of the present invention 3 described above, lens frame 510 has connecting hole 518, when lens frame 510 receives the 1st lens 320, the 2nd lens 330 and the 3rd lens 340 successively from object side, this connecting hole 518 connects the 1st space K1 and the 2nd space K2, the value being formed as the surface area of the outside surface of lens frame 510 to obtain divided by the volume of lens frame 510 is more than 4, the dip plane 519 of tapering 510b is formed thinner compared with other side, therefore, can have nothing to do in the temperature of environment for use, reliably prevent from producing condensation in the 1st lens 320.

(embodiment 4)

Then, embodiments of the present invention 4 are described.The lens assembly of present embodiment 4 and the difference of above-mentioned embodiment are only the shape of lens frame.Therefore, only the structure of the lens assembly of present embodiment 4 is described below.In addition, identical to the embodiment 1 with above-mentioned structure marks identical label.

Figure 12 is the cut-open view of the lens assembly of present embodiment 4.In addition, in fig. 12 left side is described as front side, right side as rear side.

Lens assembly 600 shown in Figure 12 has lens frame 610, the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st by pressure ring 350, the 2nd by pressure ring 360,1O ring 370 and 2O ring 380, and described lens frame 610 is provided with for making the optical axis of multiple lens as one man be received and the structure of fixing in internal arrangement by multiple lens.

Lens frame 610, in the roughly frustum of a cone diminished from front side towards rear side diameter, is formed with the space in the roughly frustum of a cone in inside.Specifically, lens frame 610 has in circular base end part 610a, is formed with in the mode expanded from rear side diametrically outer circumferential side toward the front side the tapering 610b of the dip plane bent projectedly to inner circumferential side and is circular leading section 610c.The mode that lens frame 610 connects continuously with base end part 610a, tapering 610b and leading section 610c forms.Lens frame 610 is formed by stainless steel and resin or compound substance such as ABS resin etc.The ratio of volume and surface area that lens frame 610 is formed as lens frame 610 meets predetermined condition.Specifically, lens frame 610 is formed as meeting the value obtained divided by the volume of lens frame 610 by the surface area of the outside surface of lens frame 610 is more than 4.

In addition, be provided with at the inner face of lens frame 610: the 1st fixed part 611 fixing the 1st lens 320, the 2nd fixed part 612 fixing the 2nd lens 330, fix the 3rd lens 340 the 3rd fixed part 613, fix 1O ring 370 the 4th fixed part 614, fix the 1st by pressure ring 350 the 5th fixed part 615, fix 2O ring 380 the 6th fixed part 616 and fix the 2nd by the 7th fixed part 617 of pressure ring 360.The diameter that 1st fixed part the 611 ~ 7th fixed part 617 is respective and the 1st lens 320, the 2nd lens 330, the 3rd lens 340, the 1st are formed by the external diameter of pressure ring 360,1O ring 370 and 2O ring 380 accordingly by pressure ring 350, the 2nd.In addition, the 2nd fixed part 612 is provided with the connecting hole 618 of multiple connection the 1st space K1 and the 2nd space K2.

In addition, the outside surface of lens frame 610 is provided with the aduncate dip plane of level and smooth angle 619 and the jut 601 chimeric with the groove portion 202 of adapter apparatus 200.Screw chasing is implemented at the outside surface of jut 601.In addition, the dip plane 619 of lens frame 610 is formed thinner compared with other side.In addition, concavo-convex processing is implemented at the outside surface of lens frame 610 of the dip plane 619 comprising tapering 610b.Thus, the surface area of lens frame 610 increase compared with volume.

In embodiments of the present invention 4 described above, lens frame 610 has the connecting hole 618 of connection the 1st space K1 and the 2nd space K2, the value being formed as the surface area of the outside surface of lens frame 610 to obtain divided by the volume of lens frame 610 is more than 4, dip plane 619 is formed thinner and implements concavo-convex processing compared with other side, therefore, can have nothing to do in the temperature of environment for use, reliably prevent from producing condensation on the 1st lens 320.

[embodiment]

Below, as embodiments of the invention, the analog result corresponding to each embodiment with above-mentioned is described.Figure 13 is the figure of the parameter value of the lens frame illustrated in examples and comparative examples of the present invention.Figure 14 is the figure of the analysis result of the temperature that various embodiments of the present invention and each comparative example are shown.In fig. 14, transverse axis represents the value obtained divided by the volume of this lens frame by the surface area of the outside surface of lens frame, on the other hand, the longitudinal axis represents and moves in the environment of-10 DEG C after making the temperature of lens assembly become 40 DEG C, lens frame when have passed through 420 seconds after movement and the temperature difference (hreinafter referred to as temperature difference) between the 1st lens 320.Below, with reference to Figure 13 and Figure 14, embodiments of the invention 1 ~ 6 and comparative example 1 ~ 2 are described.

(embodiment 1)

Embodiments of the invention l is described.In the present embodiment 1, in the shape of the lens assembly 300 of above-mentioned embodiment 1, the minimum thickness of tapering 310b is set to 2.21mm, the surface area of outside surface of lens frame 310 is set to 62.0cm 2, lens frame 310 volume be set to 15.0cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 310 by the surface area of the outside surface of lens frame 310 is 4.13.Under above condition, carry out the result simulated, temperature difference is 0.9 DEG C, does not condense in the 1st lens 320.In fig. 14, the result of the present embodiment 1 is represented by a P1.

(embodiment 2)

Then, embodiments of the invention 2 are described.The thickness that the minimum thickness of tapering 410b is set to 2.5mm(concavo-convex, in the shape of the lens assembly 400 of above-mentioned embodiment 2, is set to 1mm by the present embodiment 2), the surface area of the outside surface of lens frame 410 is set to 307cm 2, lens frame 410 volume be set to 16.9cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 410 by the surface area of the outside surface of lens frame 410 is 18.17.Under above condition, carry out the result simulated, temperature difference is-8.8 DEG C, does not condense in the 1st lens 320.In fig. 14, the result of the present embodiment 2 is represented by a P5.

(embodiment 3)

Then, embodiments of the invention 3 are described.The thickness that the minimum thickness of tapering 421b is set to 2.5mm(concavo-convex, in the shape of the lens assembly 420 of the variation 1 of above-mentioned embodiment 2, is set to 1mm by the present embodiment 3), the surface area of the outside surface of lens frame 421 is set to 145cm 2, lens frame 421 volume be set to 16.9cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 421 by the surface area of the outside surface of lens frame 421 is 8.58.Under above condition, carry out the result simulated, temperature difference is-3.8 DEG C, does not condense in the 1st lens 320.In fig. 14, the result of the present embodiment 3 is represented by a P3.

(embodiment 4)

Then, embodiments of the invention 4 are described.The thickness that the minimum thickness of tapering 431b is set to 2.5mm(concavo-convex, in the shape of the lens assembly 430 of the variation 2 of above-mentioned embodiment 2, is set to 1mm by the present embodiment 4), the surface area of the outside surface of lens frame 431 is set to 199cm 2, lens frame 431 volume be set to 16.9cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 431 by the surface area of the outside surface of lens frame 431 is 11.78.Under above condition, carry out the result simulated, temperature difference is-6.1 DEG C, does not condense in the 1st lens 320.In fig. 14, the result of the present embodiment 4 is by a P4.

(embodiment 5)

Then, embodiments of the invention 5 are described.The minimum thickness of tapering 510b, in the shape of the lens assembly 500 of above-mentioned embodiment 3, is set to 0.47, the surface area of the outside surface of lens frame 510 is set to 56.9cm by the present embodiment 5 2, lens frame 510 volume be set to 8.53cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 510 by the surface area of the outside surface of lens frame 510 is 6.67.Under above condition, carry out the result simulated, temperature difference is-0.2 DEG C, does not condense in the 1st lens 320.In fig. 14, the result of the present embodiment 5 is represented by a P2.

(embodiment 6)

Then, embodiments of the invention 6 are described.The thickness that the minimum thickness of tapering 610b is set to 1.5(concavo-convex, in the shape of the lens assembly 600 of above-mentioned embodiment 4, is set to 1mm by the present embodiment 6), the surface area of the outside surface of lens frame 610 is set to 286cm 2, lens frame 610 volume be set to 10.8cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 610 by the surface area of the outside surface of lens frame 610 is 26.48.Under above condition, carry out the result simulated, temperature difference is-9.6 DEG C, does not condense in the 1st lens 320.In fig. 14, the result of the present embodiment 6 is represented by a P6.

(comparative example 1)

Then, comparative example 1 of the present invention is described.Figure 15 is the cut-open view of the lens assembly of comparative example 1 of the present invention.In addition, only different to the embodiment 1 from above-mentioned below parts is described.In addition, identical to the embodiment 1 with above-mentioned structure marks identical label and is described.

Lens assembly 700 shown in Figure 15 is compared with the lens assembly 300 of above-mentioned embodiment 1, and dip plane 701 is formed thicker.Specifically, dip plane 701 is the states of not carrying out R processing, linearly.

In the shape of the lens assembly 700 of the comparative example 1 formed like this, the minimum thickness of tapering 710b is set to 2.54mm, the surface area of outside surface of lens frame 710 is set to 61.8cm 2, lens frame 710 volume be set to 17.1cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 710 by the surface area of the outside surface of lens frame 710 is 3.61.Under above condition, carry out the result simulated, temperature difference is 1.3 DEG C, in the 1st lens 320, create condensation.In fig. 14, the result of this comparative example 1 is represented by a R1.

(comparative example 2)

Then, comparative example 2 of the present invention is described.Figure 16 is the cut-open view of the lens assembly of comparative example 2 of the present invention.In addition, only different to the embodiment 2 ~ 4 from above-mentioned below parts is described.In addition, identical to the embodiment 1 with above-mentioned structure marks identical label and is described.

In the lens assembly 800 shown in Figure 16, the dip plane 819 of the tapering 810b of lens frame 810 is formed thicker compared with the dip plane 419 of the tapering 410b of the lens frame 410 of the lens assembly 400 of embodiment 2.In addition, concavo-convex processing is not implemented at the outside surface of the lens frame 810 of lens assembly 800.

In the shape of the lens assembly 800 of the comparative example 2 formed like this, the minimum thickness of tapering 810b is set to 2mm, the surface area of outside surface of lens frame 810 is set to 64.8cm 2, lens frame 810 volume be set to 16.9cm 3, and the thickness of the central part of the 1st lens 320 is set to 1.8mm.The value obtained divided by the volume of lens frame 810 by the surface area of the outside surface of lens frame 810 is 3.83.Under above condition, carry out the result simulated, temperature difference is 2 DEG C, in the 1st lens 320, create condensation.In fig. 14, the result of this comparative example 2 is represented by a R2.

Known by embodiment 1 ~ 6 described above, comparative example 1 ~ 2, if the value obtained divided by the volume of this lens frame by the surface area of the outside surface of lens frame is more than 4, and become making the temperature of lens assembly the environment that 40 DEG C move to-10 DEG C later, lens frame when have passed through 420 seconds after movement and the temperature difference between the 1st lens 320 are less than 1 DEG C, then can not produce condensation in the 1st lens 320.

Claims (6)

1. a lens assembly, its with subject is made a video recording and the camera head that generates the view data of this subject can the mode of disassembled and assembled freely be connected, the feature of this lens assembly is, has:
Lens frame, it makes the optical axis of multiple lens as one man be received in internal arrangement by the plurality of lens and fix;
1st lens, it is fixed in one end of described lens frame;
2nd lens, it is fixed at the pars intermedia of the optical axis direction of described lens frame; And
3rd lens, it is fixed at the other end of described lens frame,
Described lens frame has the connecting hole in connection the 1st space and the 2nd space, 1st space is formed between described 1st lens and described 2nd lens, 2nd space is formed between described 2nd lens and described 3rd lens, and the value obtained divided by the volume of this lens frame by the surface area of the outside surface of this lens frame is 4cm 2/ cm 3above.
2. lens assembly according to claim 1, is characterized in that, this lens assembly has:
1st filling component, it is circular, is located between described 1st lens and described lens frame, fills the gap between described 1st lens and described lens frame;
2nd filling component, it is circular, is located between described 3rd lens and described lens frame, fills the gap between described 3rd lens and described lens frame;
1st fixed part, they are between described 1st lens and described lens frame, and the other end direction of described 1st lens to described lens frame is pressed and be fixed relative to described lens frame; And
2nd fixed part, they are between described 3rd lens and described lens frame, and the extreme direction of described 3rd lens to described lens frame is pressed and be fixed relative to described lens frame.
3. lens assembly according to claim 1 and 2, is characterized in that,
Described lens frame is circular cone shape, and this frustum of a cone has the inclined-plane bent projectedly to inner circumferential side.
4. lens assembly according to claim 1, is characterized in that,
The face that described 1st lens expose from described lens frame is formed as plane,
The face that described 3rd lens expose from described lens frame is formed as plane.
5. lens assembly according to claim 1, is characterized in that,
This lens assembly is wide-angle breakout box.
6. lens assembly according to claim 1, is characterized in that,
Also accompany between described 1st lens and described lens frame and between the 3rd lens and described lens frame heat conductivity high by pressure ring and seal member.
CN201310168472.3A 2012-05-07 2013-05-06 Lens device CN103389556B (en)

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JP2012106220A JP6027766B2 (en) 2012-05-07 2012-05-07 Lens device
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JP2012128323A JP6009826B2 (en) 2012-06-05 2012-06-05 Lens device

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TWI582480B (en) * 2015-06-18 2017-05-11 Quick dew dissipation of the lens module
CN108037578B (en) * 2018-01-10 2019-10-18 浙江舜宇光学有限公司 Camera-lens system

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CN1601357A (en) * 2001-08-31 2005-03-30 富士通显示技术株式会社 Liquid crystal display device and manufacturing method therefor
CN101517448A (en) * 2006-09-20 2009-08-26 奥林巴斯医疗株式会社 Imaging unit and endoscope using it

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JPH09159895A (en) * 1995-12-04 1997-06-20 Nikon Corp Lens barrel
JP4498343B2 (en) * 2006-12-01 2010-07-07 三菱電機株式会社 Lens unit
JP4999508B2 (en) * 2007-03-20 2012-08-15 日立マクセル株式会社 Lens unit

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Publication number Priority date Publication date Assignee Title
CN1601357A (en) * 2001-08-31 2005-03-30 富士通显示技术株式会社 Liquid crystal display device and manufacturing method therefor
CN101517448A (en) * 2006-09-20 2009-08-26 奥林巴斯医疗株式会社 Imaging unit and endoscope using it

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Effective date of registration: 20151202

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Patentee after: Olympus Corporation

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Patentee before: Olympus Imaging Corp.