CN2453459Y - Camera lens with external shutler - Google Patents

Abstract

The utility model relates to a lens with an outer shutter. The inner part of a lens barrel is provided with two groups of lenses, a first group of lenses is a double convex lens and is positioned on the beginning end of the lens barrel. A second group of lenses tightly follows the first group of lenses, and the second group of lenses is composed of a piece of biconcave lens, a piece of meniscus lens and a piece of convex lens in sequence. The position of a light ring is positioned in front of the first group of lenses, and a shutter group is arranged on the position of the light ring and is positioned in the lens barrel. The utility model can cause the integration of the variable shutter and the light ring to become very easy, and the utility model is totally composed of spherical lenses made and processed by means of conventional milling and polishing technology and is especially suitable for portable digital equipment. In addition, the utility model can be compatible with sensors of micro lens arrays.

Description

Camera lens with external shutter

The utility model relates to a kind of camera lens with external shutter, is a kind of high resolution camera lens for the outfit of electronic imaging sensor, is particularly suitable for digital camera and uses.

Use the digital camera of high resolution electronic imaging sensor to be equipped with and can produce in a large number and not expensive high resolution camera lens, this need be particularly outstanding in the digital camera of consumption market.For certain specific sensor,, must increase mechanical shutter and iris ring for its camera lens in order to obtain higher sensor performance.For the photo that photographs good result under various bright degrees generally also needs iris ring.When taking in darker environment, aperture must all be opened, and so just can make enough illumination be mapped to sensor.In bright environment, aperture must dwindle, and can reduce the quantity of the light that is injected into sensor like this, and is saturated to avoid sensor.And reduce aperture and help increasing the depth of field, thereby in a very big distance range, make illuminated object be in one clearly on the focal length.To some specific sensor chips of transmission frame by frame, in order to obtain induction information clearly, the zone of action of chip must be in the conductively-closed of sense data stage.This just need must stop entering of light fully at the stage mechanical shutter of reading.An independent mechanical hook-up can be finished two kinds of functions.The benefit of so difunctional equipment is to reduce cost and saves the space, and makes the camera lens combination compact.Yet in order to keep the function of iris ring, this difunctional equipment must be placed on the aperture place (also being diaphragm) of this lens design.

The high resolution camera lens generally is made of the single eyeglass of several separation, does like this and can offset optical distortion (or blemishes).Therefore the cost of camera lens is determined by following factors: single eyeglass quantity, every cost and each eyeglass is assembled into the expense of a lens group.In the former technology, camera lens is often by following two kinds of methods design.First method, all eyeglasses all are spherical mirrors, i.e. the part of sphere.The advantage of this method is that all eyeglasses can grind and polishing processing with classic method.But the shortcoming of this method is in order to reach a good distortion correction effect, to need to use a large amount of eyeglasses.A large amount of use eyeglasses not only makes the cost of camera lens increase but also makes lens construction very not compact.And compact camera lens is very suitable for the digital camera in ordinary consumption market, because portable digital camera needs the tiny lens group.For example the digital camera of mobile phone, palm PC design is also essential uses compact camera lens for other portable mobile apparatus, because these products have very tight space (volume) restriction.Another high resolution lens design scheme is to use aspherical lens.It is aspheric surface that aspherical lens has one or two surface, can not process aspherical lens easily with traditional grinding and polishing technology.Therefore can use various different plastics and low melting glass as starting material, produce with die sinking tool injection molding technology.Although glass lens is more cheap, the precision of glass lens does not reach the requirement of high resolution camera.And most plastic material ratios are easier to expand with heat and contract with cold and are mouldy because of humidity easily.These characteristics of plastics can change the optical property of glass lens with the change of environment.Although we can point-device manufacturing aspheric surface glass mirror, aspheric surface glass technology for making is not extensively grasped, and the manufacturing cost of aspheric surface glass will be much higher than the plastic aspherical element manufacturing cost under same shape.

The combination of lens optical kernel and iris ring/fast door equipment also can influence the expense of lens group because in assembling process variable shutter combination must with very accurate the aliging of lens element.The technological requirement of the camera lens of existing design is placed on the shutter group between the monolithic eyeglass, because the aperture of these designs is set between each eyeglass.Think that usually aperture is placed on the eyeglass centre can be easy to eliminate image distortion.People believe at large, do not use the camera lens about front shutter symmetry discharging principle to be difficult to reach the distortion that disappears well.Yet it is very expensive using this optical design to come integrated iris ring/fast door equipment, just is difficult between the eyeglass aborning each eyeglass critically alignd because if aperture is clipped in.

The purpose of this utility model is to design a kind of camera lens with external shutter, not only make the integrated of variable shutter/aperture become very easy, and all use the spheric glass of traditional abrasive polishing process processing to form, compact conformation, be particularly suitable for portable digital device, and can be compatible with the sensor of micro mirror array.

Design proposal of the present utility model: a kind of camera lens with external shutter, comprise lens barrel (5), shutter group (6), lens barrel is provided with two set of contact lenses in (5), and first set of contact lenses is positioned at the top of lens barrel (5), and second set of contact lenses follows first set of contact lenses closely; First set of contact lenses is a biconvex mirror (1), second set of contact lenses is successively by a slice biconcave mirror (2), a slice meniscus lens (3) and a slice biconvex mirror (4) are formed, and the position of aperture is positioned at before first set of contact lenses, and shutter group (6) is arranged on the position of aperture and is positioned at lens barrel (5).

The biconvex mirror of first set of contact lenses (1) is a gummed mirror, is formed by a slice meniscus lens (7) and a slice biconvex mirror (8) gummed.Described eyeglass all be sphere and all make by glass material.

The utlity model has following advantage and effect:

1, is positioned at before first eyeglass owing to aperture of the present utility model, optical mirror slip can be encapsulated in the very accurate lens barrel, the optical quality of checking camera lens that can be independent itself, shutter group and independent pre-packed optical lens combination, have very high reliability and repeatability, can improve the throughput rate when producing in enormous quantities.

2, the utility model all uses the spherical glass eyeglass composition that traditional abrasive polishing process is processed into, and compact conformation is with low cost, is particularly suitable for portable digital device and uses.

3, the utility model is by being placed on aperture before first set of contact lenses, thus by the aperture center can boundly can make them more vertical from axial ray with respect to image planes, be very beneficial for using the electronic imaging sensor of micro mirror array.

4, the utility model can be expanded according to different focal lengths, therefore can be the supporting suitable camera lens of the sensor in the certain limit.The scheme of different focal can be amplified or the method for dwindling existing scheme obtains by equal proportion.

Although 5 this optical lens of the present utility model do not have symmetry fully, but the utility model is under the situation of relative aperture f/2.8, also can provide very outstanding optical quality in the field ranges at+/-30 degree, be very suitable for 4 microns of minimum pixels and sum of all pixels reach 200 ten thousand sensor imaging, maximum geometric distortion is generally less than 2%.

Fig. 1 is the structural representation of first kind of scheme of the utility model,

In conjunction with Fig. 1 first kind of embodiment of the present utility model described.A kind of camera lens with external shutter comprises lens barrel (5), shutter group (6), and lens barrel is provided with two set of contact lenses in (5), and first set of contact lenses is positioned at the top of lens barrel (5), and second set of contact lenses follows first set of contact lenses closely; First set of contact lenses is a biconvex mirror (1), second set of contact lenses is successively by a slice biconcave mirror (2), a slice meniscus lens (3) and a slice biconvex mirror (4) are formed, and the position of aperture is positioned at before first set of contact lenses, and shutter group (6) is arranged on the position of aperture and is positioned at lens barrel (5).Described eyeglass all be sphere and all make by glass material.Wherein first set of contact lenses has been finished the main amplification focusing function of camera lens, and second set of contact lenses is for first set of contact lenses provides the optical distortion compensation, to reach the effect of calibrating optical blemishes.The camera lens surface parameter sees the following form:

Eyeglass		Radius	Surface radius	Distance between axles	Refractive index	The Abbe coefficient
							Aperture position			-	?1.9358679E-002
Eyeglass 1	?R1		3.8630600E+000	?9.7497407E-001	?1.85544	?36.59
							?R2		-1.0949689E+001	?4.1938736E-001
	Eyeglass 2	?R3		-3.5840039E+000	?7.0701838E-001	?1.91761							?21.51
?R4							5.5340363E+000	?3.3068768E-001
		Eyeglass 3	?R5		-6.0461650E+000	?1.2803852E+000					?1.80279	?46.76
?R6							-2.8591?050E+000	?0.0
			Eyeglass 4	?R7		6.2365452E+000					?1.3698834E+000	?1.71300	?53.83
?R8		-2.6474757E+001					?2.9640898E+000

Four all in this camera lens implementation eyeglasses all are spheres.Describe out the first set of contact lenses biconvex mirror (1) with surface radius R1 and R2 in last table, the two sides all is the part of sphere.Listed the surface radius of all eyeglasses in the last table, the surface of the biconcave mirror of second set of contact lenses (2) represents that with R3 and R4 the surface of meniscus lens (3) represents that with R5 and R6 the surface of last a slice biconvex mirror (4) is represented with R7 and R8.

Eyeglass (2), (3), (4) and eyeglass (1) combine has corrected optical distortion fully.Because the achromatism ability that the design is outstanding, make this camera lens can the f/2.8 aperture and+provide very high optical resolving power in the visual fields of/-30 degree.This field angle and relative aperture are particularly suitable for the high resolution digital camera, and the effective focal length of this concrete scheme is 4.5mm.This scheme also is very suitable for the sensor that maximum diagonal is of a size of 3.2mm.And the distance from the aperture position to image planes only has 8.05mm, and for this high-performance camera lens, this profile is very little, can provide a kind of very attractive short and small, compact design for production in enormous quantities like this.

Claims (2)

1, a kind of camera lens with external shutter comprises lens barrel (5), and shutter group (6) is characterized in that: lens barrel is provided with two set of contact lenses in (5), and first set of contact lenses is positioned at the top of lens barrel (5), and second set of contact lenses follows first set of contact lenses closely; First set of contact lenses is a biconvex mirror (1), second set of contact lenses is successively by a slice biconcave mirror (2), a slice meniscus lens (3) and a slice biconvex mirror (4) are formed, and the position of aperture is positioned at before first set of contact lenses, and shutter group (6) is arranged on the position of aperture and is positioned at lens barrel (5).

2, the camera lens with external shutter according to claim 1 is characterized in that: described eyeglass all be sphere and all make by glass material.

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