CN1181373C - Wide-angle pinhole television lens - Google Patents
Wide-angle pinhole television lens Download PDFInfo
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- CN1181373C CN1181373C CNB021239584A CN02123958A CN1181373C CN 1181373 C CN1181373 C CN 1181373C CN B021239584 A CNB021239584 A CN B021239584A CN 02123958 A CN02123958 A CN 02123958A CN 1181373 C CN1181373 C CN 1181373C
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- 230000003287 optical effect Effects 0.000 claims abstract description 82
- 210000001747 pupil Anatomy 0.000 claims abstract description 47
- 230000004075 alteration Effects 0.000 claims abstract description 18
- 230000003247 decreasing effect Effects 0.000 claims abstract description 10
- 238000012937 correction Methods 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims abstract description 5
- 238000012546 transfer Methods 0.000 description 14
- 230000000007 visual effect Effects 0.000 description 14
- 238000013461 design Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
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- 239000000470 constituent Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 210000000887 face Anatomy 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
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- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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Abstract
The present invention relates to a wide-angle pinhole television lens. An optical system comprises an entrance pupil, a first mirror group, a second mirror group, the aperture diaphragm and a third mirror group, wherein the first mirror group is arranged behind the entrance pupil. The second mirror group which determines the characteristics of an aperture diaphragm is arranged behind the first mirror group, and the aperture diaphragm which controls luminous flux is arranged behind the second mirror group. The third mirror group leads the optical system to have symmetry and correction aberration. The second mirror group satisfies the conditions that for any point on a focal plane, the ratio of the diameter of the aperture diaphragm which is formed by the entrance pupil by means of the second mirror group and the diameter of the entrance pupil is a decreasing function of a field angle of the point. The present invention mainly solves the problem that a field angle of the existing pinhole television lens is small, and simultaneously, also solves the problem that the lens can be fixed after a user makes many auxiliary devices.
Description
Technical field
The invention belongs to the optical equipment field, specifically, it is a kind ofly to finish the wide-angle pinhole television lens of pin hole shooting with television camera.
Background technology
In actual life, run into the situation that to carry out television monitoring through regular meeting.For example in the museum, in the bank counter, jeweler's shop,, through regular meeting television cameras are set and record for activity such as prevent that the lawless person from stealing.But as openly being set, a big telephotography head will destroy harmonious atmosphere, if in implementing the television monitoring process, the style that disclosed television camera will destroy museum has been installed as places such as museums.When the reporter interviews illegal act, lay oneself open to dangerous condition if may make during with video camera subtend interviewee.If openly being installed in the jeweler's shop, a big camera head will make client can not be happy under the supervision of television camera the calm free choice of goods.
So occurred and the supporting television cameras of finishing the pin hole shooting of television camera, television cameras are installed on the television camera, there is pin hole the front of television cameras, principle according to pin-hole imaging, light enters from pin hole, passed through the mirror group of converging action, be imaged at last on the photoelectric commutator of video camera, photoelectric commutator is converted to electric signal with light signal.The entrance pupil of this television cameras is positioned at total system foremost.And its entrance pupil of general television cameras is positioned at the inside of system, and its first lens face is maximum in the total system often.Obviously the camera lens before is to be difficult to hidden use, and this pinhole lens is quite different, and the entrance pupil of pinhole lens is unique inlet of all incident lights, and it is a radial dimension minimum in the total system.Because pinhole television lens has good disguise, be difficult to be monitored object and discover, therefore be widely used in occasions such as museum, bank counter, jeweler's shop.
But present this pinhole lens field angle mostly is about 60 degree, surpasses the also few of 80 degree visual angles, have field angle problem less than normal, and the more assistive device of user's do-it-yourself that fixedly needs of camera lens could solve.
Summary of the invention
The present invention proposes a kind of wide-angle pinhole television lens, its fundamental purpose is to solve existing pinhole television lens field angle problem less than normal, and secondary objective is the problem that fixedly needs the more assistive device of user's do-it-yourself that solves camera lens.
The inventor is engaged in the research of this respect for many years, from optical system, structural design all has the particular views of oneself to the operation technique of video camera, solution of the present invention is: a kind of wide-angle pinhole television lens, it comprises entrance pupil, there is the first mirror group back of entrance pupil, there is the second mirror group of decision aperture diaphragm characteristic the back of the first mirror group, there is the aperture diaphragm of control luminous flux the back of the second mirror group and makes optical system have symmetry, aberration correction and the 3rd mirror group of focussing force is arranged, the condition that the second mirror group satisfies is: on the focal plane more arbitrarily, the diameter of the aperture diaphragm that its entrance pupil forms by the second mirror group and the diameter ratio of entrance pupil are the decreasing functions of the field angle of this point.
Described entrance pupil is located at the front end of a camera lens cap assembly, and described first, second and third mirror group is located in the camera lens main body.The camera lens cap assembly is provided with the locking wheel that is connected with object on every side, and locking wheel is that screw pair is connected with the camera lens cap assembly.
Effect of the present invention is: because pinhole lens before this has only entrance pupil and a mirror group, the filed curvature of this structure, astigmatism and distortion all sharply increase with the increase of field angle, so its field angle can be very not big.Its illuminance also is uneven, is only circularly along the beam cross-section of optical axis directive entrance pupil because have only, and other direction all is disciform.The luminous energy that enters in the optical system during gradually away from optical axis when light beam descends rapidly, and the image planes vignetting that this phenomenon causes can directly have influence on the effect of telephotography.And the present invention makes the entrance pupil of system form optical image in internal system by adding the second mirror group of regulating light-inletting quantity, and this optics real image is exactly variable aperture light hurdle, and aperture diaphragm has been the mechanism that restriction enters system's luminous flux.Design the second mirror group, the light that makes the different visual angles that enters optical system is all through a definite zone, its entrance pupil is the decreasing function of different field angle by the diameter of the aperture diaphragm that the second mirror group forms with the diameter ratio of entrance pupil, be B=Dp/Dp '=f (ω), Dp represents the aperture diaphragm diameter, Dp ' represents the entrance pupil diameter, and ω is any certain field angle of optical system.Like this, light beam is more away from optical axis, and its ω value is big more, and B=Dp/Dp '=f (ω) is more little, that is to say that the corresponding contraction of the diameter of aperture diaphragm at that point will be turned off the segment beam of small angle earlier in closing the process of aperture diaphragm.That is to say, the light beam that it has remedied away from optical axis enters into the problem that luminous energy descends rapidly in the optical system, improved the relative scale that enters into the luminous energy in the optical system away from the light beam of optical axis, so the present invention has improved the field angle of pinhole television lens greatly.And the existence of the 3rd mirror group of the present invention is owing to introduced the second mirror group, if the optical system structure form does not satisfy symmetric condition, just having some aberrations can't proofread and correct, the function that the 3rd mirror group not only has the system of finishing to focus on, also design in order to make system have certain symmetry, it has the effect of aberration correction.Pin hole optical system of the present invention has very high optical property index, for example the geometric distortion of optical system can be less than general wide-angle optical lens, though pinhole television lens of the present invention has field angle maximum distortion in whole image of 105 degree to be no more than 6%.
Again because the present invention is designed to pinhole television lens the form of camera lens cap assembly and camera lens main body, the camera lens cap assembly is provided with the locking wheel that is connected with object on every side, locking wheel is that screw pair is connected with the camera lens cap assembly, therefore light well can be adjusted accurately with the relative position of object on every side on the camera lens cap, and the fixing of camera lens no longer needs the more assistive device of user's do-it-yourself to carry out.
Description of drawings
Fig. 1 is the general pinhole television lens optical system synoptic diagram that has only the first mirror group.
Fig. 2 is the basic optical ingredient structural representation of wide-angle pinhole television lens of the present invention.
Fig. 3 is the index path of the concrete components and parts of wide-angle pinhole television lens of the present invention.
Fig. 4 a, 4b, 4c are the main aberration curve figure of wide-angle pinhole television lens optical system of the present invention, and wherein Fig. 4 a is that axle is gone up the spherical aberration curve; Fig. 4 b is a curvature of field curve; Fig. 4 c is a distortion curve.
Fig. 5 a, 5b, 5c, 5d, 5e, 5f are wide-angle pinhole television lens optical transfer function curve maps of the present invention, and wherein Fig. 5 a is the optical transfer function curve map of full visual field, and Fig. 5 b is the optical transfer function curve map of 0.85 visual field; Fig. 5 c is the optical transfer function curve map of 0.7 visual field; Fig. 5 d is the optical transfer function curve map of 0.5 visual field; Fig. 5 e is the optical transfer function curve map of 0.3 visual field; Fig. 5 f is the optical transfer function curve map that axle is gone up point.
Fig. 6 is the general shape assumption diagram of the pinhole television lens of prior art.
Fig. 7 is the assembling shape assumption diagram of pinhole television lens of the present invention.
Specific implementation
Fig. 1 is the general pinhole television lens optical system synoptic diagram that has only the first mirror group.1 is entrance pupil among the figure, and 2 is first mirror groups, and entrance pupil is positioned at total system foremost.Generally, entrance pupil will leave first certain distance of the first mirror group, helps camera lens and tilts to use.The first mirror group (2) may be the version of more complicated, forms such as four groups six for example, but concrete optical texture form is a lot of are as long as after satisfying light and entering from pin hole, through the converging action of the first mirror group (2), be imaged on the photoelectric commutator of video camera just passable at last.Its concrete optical texture form has a lot, and these ways of realization all are well-known to those skilled in the art, is that those skilled in the art are easy to convergence of rays to realize to the function on the photoelectric commutator according to it.So do not elaborate, the back has provided the optical parametric of a specific embodiment, has disclosed the specific implementation of a constituent element device in this embodiment.
If only use the first mirror group, field angle can be very not big, because the filed curvature of this version, astigmatism and distortion are all very big, its illuminance is uneven, have only to be only circularly along the beam cross-section of optical axis directive incidence hole, other direction all is disciform.The luminous energy that enters in the optical system during gradually away from optical axis when light beam descends rapidly, and this phenomenon can directly have influence on the effect of telephotography: the television image illuminance at central point is very strong, and is very clear; And edge region, the rapid decline of its brightness of image might be also very fuzzy.And the second mirror group (3) that the present invention regulates light-inletting quantity by adding, as shown in Figure 2, the effect of the second mirror group (3) is that entrance pupil is formed optical image in internal system, optical system has just had variable aperture light hurdle like this.Aperture diaphragm (5) is to play restriction in the optical system to enter the mechanism of system's luminous flux, entrance pupil be aperture diaphragm through its front optical system imaging, it must be a real image in the present invention, flexible the flexible of entrance pupil that just mean of aperture diaphragm.Axial location between entrance pupil and the aperture diaphragm is gripped altogether, and radial dimension has the multiplying power relation, and aperture diaphragm diameter Dp represents then to require with B with the ratio of entrance pupil diameter Dp ':
B＝Dp/Dp′＞1。
Ideally the relation of the position between aperture diaphragm and the entrance pupil is unique, but it is to drift about with the difference of field angle for actual optical system, and this phenomenon is referred to as light hurdle spherical aberration.The B value of general optical system is less than 1, and the present invention requires the B value big as far as possible.On the optical system focal plane arbitrarily the illuminance E of any be the function of corresponding field angle ω, the illuminance of establishing focus on the optical system axis is E
0E and E
0Ratio be:
E/E
0＝K.cos
4ω
This formula has just illustrated the difference ratio of illuminance on the image planes quantitatively.For the optical system that 105 degree (half-angle ω=52.5 °) field angle are arranged, in the ideal case (visual field coefficient of vignetting K=1, and the luminance brightness of scenery is very even), the illuminance of marginal belt also has only 13.7% of central point illuminance.More than be a general difficult problem, introduce how to reduce cos below in order to illustrate that better the wide-angle lens designing institute runs into
4The ω effect, and then enlarge field angle.
Constructing pupil function, eliminating the image planes vignetting, reach the purpose that enlarges field angle at last is by designing the second mirror group, make on the focal plane more arbitrarily, the diameter of the aperture diaphragm that its entrance pupil forms by the second mirror group and the diameter of entrance pupil are than the decreasing function that is the field angle of this point, just make function B=Dp/Dp=f noted earlier (ω), Dp represents the diameter of aperture diaphragm, Dp ' represents the diameter of entrance pupil, and ω is any field angle of any on the focal plane.Like this, light beam is more away from optical axis, and its ω value is big more, B=Dp/Dp '=f (ω) is more little, that is to say the corresponding contraction of the diameter of aperture diaphragm at that point, can at first turn off the segment beam of small angle in closing the process of aperture diaphragm, the energy of this part light beam is very strong.Like this, the light beam that has just remedied away from optical axis enters into the problem that luminous energy descends rapidly in the optical system, improved light beam away from optical axis and entered into luminous energy ratio in the optical system, so the present invention has improved the field angle of pinhole television lens greatly.
The f here (ω) is a decreasing function arbitrarily, can be linear such as it, as f (ω)=A+K ω, wherein K＜0; Also can be non-linear, as f (ω)=A+Kcos ω etc., constant A and K can be predetermined, also can in the optical design process, guide automatically, must be decreasing function in a word, because this decreasing function is design arbitrarily, the notion with " decreasing function " is not done qualification to functional form in claim 1.
After the function of f (ω) is decided, be exactly how to have realized the problem of f (ω) by optical device, in fact the realization of f (ω) is to realize by optical texture and concrete optical parametric that the second mirror group is set, its concrete optical texture form has a lot, and these ways of realization all are well-known to those skilled in the art, be that those skilled in the art are easy to realize according to f (ω), so do not elaborate, the back has provided the optical parametric of a specific embodiment, has disclosed the concrete data of a constituent element device in this embodiment.
Explained later once why use in the claim 1 " condition that the second mirror group satisfies is: on the focal plane more arbitrarily; the diameter of the aperture diaphragm that its entrance pupil forms by the second mirror group and the diameter of entrance pupil are than the decreasing function that is the field angle of this point " literary style of such functional descriptions seemingly limits the second mirror group, rather than limits with architectural feature.The guidelines for examination regulation; have only when adopting Structural Characteristics to be difficult to really the technical characterictic of technical scheme is made qualification; perhaps adopt functional descriptions clearer for a person skilled in the art than adopting structural description really; and can clear and definite its protection domain according to this functional descriptions those skilled in the art; the realization of its function is known those skilled in the art; could adopt functional descriptions, and this just situation of the present invention.There is a singularity in this field of optical device: when knowing effect that a certain device can reach or the function of finishing; the optical texture of its optical component and the form of parameter are infinite; they can both realize this function or effect; and those skilled in the art know these implementations; they can both be exhaustive go out the mode of this function of a lot of realizations and function and the performing creative labour that do not cost a lot of money; limiting protection domain with functional descriptions in this case will be more more suitable than Structural Characteristics; if employing a kind of structure wherein represents in fact just can not reach the purpose of protection; in fact first assembly of the present invention and the 3rd assembly also are to adopt its function of finishing to limit in the claims; the specific implementation form of optical device that can finish this function is too many; as limiting, can't reach the purpose of protection with a kind of structure at all.This is by the decision of the singularity of optical field.
In addition, also can be provided with the light hurdle control gear of machinery at described aperture diaphragm place.The notion of aperture diaphragm is optic, it is to form on the optics, no matter there is the mechanism that does not have machinery at this place, it all exists, if and establish the light hurdle control gear of a machinery again at this place, just can adjust the light that advances at aperture diaphragm place, camera lens is had than the better photographic effect of pinhole television lens with other method design by the light hurdle control gear of control machinery.
If the Aberration Theory optical system structure form by optical design does not possess symmetric condition, optical system has some aberrations and can't proofread and correct, and this is a content known in those skilled in the art.The 3rd mirror group (4) not only has focussing force and the more important thing is to making system have that certain symmetry designs.It has the effect of aberration correction.Its concrete optical texture form has a lot, and these ways of realization all are well-known to those skilled in the art, be those skilled in the art according to make system satisfy symmetry, the such purpose of aberration correction is easy to realize, so do not elaborate, in fact its version is that the first mirror group (2) and the second mirror group (3) are derived and the function of remaining aberration.This function is a content well-known to those skilled in the art.Make system satisfy symmetry, aberration correction is in daily use for a person skilled in the art.The back has provided the optical parametric of a specific embodiment, has disclosed the specific implementation of a constituent element device in this embodiment.
The position relation that can see assembly of the present invention in Fig. 2 is: the back of entrance pupil is the first mirror group, and the back of the first mirror group is the second mirror group, and the back of the second mirror group is aperture diaphragm and the 3rd mirror group.
The present invention to the focal power φ a of the first mirror group (2) with respect to the requirement of the focal power φ of total system is:
0.7 φ≤φ a≤1.5 φ focal power here all refers to their absolute value.
The focal power φ b of the second mirror group (3) is relevant with system length ∑ L apart from l ' pa with the emergent pupil of the first mirror group (2): any structure parameter of adjusting the first mirror group (2) can change its emergent pupil apart from l ' pa, and l ' pa has just decided after the position of the entrance pupil of the version of the first mirror group (2) and system is determined.The focal power φ b of the second mirror group (3) is also just unique when system length ∑ L has the emergent pupil distance of the strict restriction and the first mirror group (2) also to determine has determined, just every adjustment primary parameter l ' pa, ∑ L just produce a new φ b in design process, and this is the content that those skilled in the art know.
In order to prove that the present invention is attainable, now lift an actual design example.
Embodiment:
The example that the present invention lifted comprises the total data of whole optical system and the structural design at pinhole lens entrance pupil position.
Example optics system performance index by the present invention's design is as follows:
System's focal power: φ=1.0;
Field angle: 2 ω=105 °;
Relative aperture: D φ=1: 2.8;
System's length overall (entrance pupil is to image planes): ∑ L=22mm;
Aperture diaphragm is apart from image planes distance: Lp-i=10.6mm.
By the example optical system of inventing design as shown in Figure 3, optical texture data such as following table:
| Radius of curvature R | Interval or thickness d | Penetrate rate Nd | Abbe number υ |
| Pin hole | |||
| ∞ | 0.918 |
| -2.5074 | 1.357 | 1.6568 | 51.1 |
| 4.1816 | 0.08 | ||
| -20.0998 | 1.517 | 1.6568 | 51.1 |
| 2.0663 | 0.08 | ||
| 4.9246 | 1.657 | 1.6568 | 51.1 |
| -4.3972 | 0.519 | ||
| 1.5317 | 0.599 | 1.755 | 27.5 |
| -8.6347 | 0.707 | ||
| -2.095 | 1.226 | 1.755 | 27.5 |
| -3.6407 | 0.301 | ||
| -2.2347 | 1.058 | 1.6568 | 51.1 |
| The light hurdle | 1.238 | ||
| -0.998 | 1.341 | ||
| 11.6208 | 0.6 | 1.755 | 27.5 |
| -1.9285 | 1.437 | 1.6568 | 51.1 |
| -87.345 | 0.12 | ||
| -4.4822 | 1.038 | 1.6568 | 51.1 |
| 5.8639 | 0.12 | ||
| -2.0287 | 1.677 | 1.6568 | 51.1 |
| -15.425 | 0.599 | 1.755 | 27.5 |
Radius of curvature R in the table is meant the surface configuration of each lens face, to the right for just, is left negative from the surface to the center of circle, and unit is mm; Lens thickness d is meant the air line distance of two faces of lens on optical axis, then is meant at interval between two lens the distance along optical axis, the same radius of curvature R of unit; Nd is the refractive index of lens material in the d light time; Abbe number υ represents the chromatic dispersion index of lens material.
Take a fancy to table in conjunction with Fig. 3.The Far Left of Fig. 3 is a pin hole, one of the left side who is the first mirror group (2) to the right faces directly, the radius-of-curvature of facing directly is ∞, be to the right a center of circle curved surface left again, radius-of-curvature is-2.5074mm, be to the right a center of circle curved surface to the right again, radius-of-curvature is 4.1816mm ... is 0.918mm from pin hole to the described distance of facing directly, face radius-of-curvature directly and be-distance of the curved surface of 2.5074mm is 1.357mm, from radius-of-curvature be-curved surface of 2.5074mm is that the distance of the curved surface of 4.1816mm is 0.08mm to radius-of-curvature ... the boundary in facing directly with radius-of-curvature is-rate of penetrating of the lens on the left side of the curved surface of 2.5074mm is 1.6568, Abbe number is 51.1, the boundary in radius-of-curvature be curved surface and the radius-of-curvature of 4.1816mm be-rate of penetrating of lens between the curved surface of 20.0998mm is 1.6568, Abbe number is 51.1
The optical system of example has obtained good aberration correction, the curve of main aberration is shown in Fig. 4 a, 4b, 4c, wherein Fig. 4 a is that axle is gone up the spherical aberration curve, Fig. 4 b is a curvature of field curve, Fig. 4 c is a distortion curve, wherein the Xs among Fig. 4 b represents the curvature of field of light beam on the sagittal surface, and Xt represents the curvature of field of light beam on the meridian ellipse.As can be seen, through the adjusted pinhole television lens of embodiment of the present invention, spherical aberration, the curvature of field, distortion have all obtained reasonable balance correction from each figure.The present invention simultaneously has good optical modulation transmission characteristic, and optical-modulation transfer function family of curves is shown in Fig. 5 a, 5b, 5c, 5d, 5e, 5f.Fig. 5 a is the optical transfer function curve map of full visual field, and Fig. 5 b is the optical transfer function curve map of 0.85 visual field; Fig. 5 c is the optical transfer function curve map of 0.7 visual field; Fig. 5 d is the optical transfer function curve map of 0.5 visual field; Fig. 5 e is the optical transfer function curve map of 0.3 visual field; Fig. 5 f is the optical transfer function curve map that axle is gone up point.S among each figure represents the transport function of light beam on the sagittal surface, and t represents the transport function of light beam on the meridian ellipse.From each figure, as can be seen,, obtained good modulation characteristic through the adjusted pinhole television lens of embodiment of the present invention.In addition, as can be seen from Figure 3, the light beam in full aperture, full visual field does not resemble and is full of aperture diaphragm the paraxial light.
Fig. 6 is the external form of prior art pinhole lens.Fig. 7 is the external form of pinhole lens structure of the present invention.Comparison diagram 6,7 can find that prior art has only camera lens main body (7), and the front end of this camera lens main body is sharp, and a pin hole is arranged, and all mirror groups are included in the camera lens main body (7).And the present invention includes camera lens main body (7) and camera lens cap assembly (6).Entrance pupil is located at the front end of camera lens cap assembly (6), and described first, second and third mirror group is located in the camera lens main body (7).Camera lens cap assembly (6) is made up of the tapered insertable camera lens of front end cap (61) and locking wheel (62) and trip bolt (63), as shown in Figure 7, the tapered insertable camera lens of front end cap (61) is used for determining camera lens entrance pupil position, locking wheel (62) is a camera lens cap assembly (6) and object on every side is connected and fixed usefulness, locking wheel (62) is that screw pair is connected with camera lens cap assembly (6), so light well can be adjusted accurately with the relative position of object on every side on the camera lens cap assembly.Trip bolt (63) is used for carrying out fastening usefulness with camera lens main body (7), without the camera lens cap assembly time, the camera lens cap assembly can be taken off.1., because the light well position of camera lens cap is subjected to breakage easily this design has following advantage:, it is easy to replacing as part separately; 2., camera lens cap and camera lens body portion are from the replacing of being convenient to video camera; 3., in equipment (as the Automatic Teller Machine) manufacture process of using the pin hole shooting, can reserve the position of video camera out exactly; 4., the various convenience of installing are provided for the user.
Claims (5)
1, a kind of wide-angle pinhole television lens, it comprises entrance pupil, there is the first mirror group back of entrance pupil, it is characterized in that: the second mirror group that decision aperture diaphragm characteristic is arranged between the first mirror group and the aperture diaphragm, aperture diaphragm has the aperture diaphragm of control luminous flux and makes optical system have symmetry away from a side of the second mirror group, aberration correction and the 3rd mirror group of focussing force is arranged, the condition that the second mirror group satisfies is: on the focal plane more arbitrarily, the diameter of the aperture diaphragm that its entrance pupil forms by the second mirror group and the diameter ratio of entrance pupil are the decreasing functions of the field angle of this point.
2, wide-angle pinhole television lens according to claim 1 is characterized in that: the light hurdle control gear that is provided with machinery at described aperture diaphragm place.
3, wide-angle pinhole television lens according to claim 1 is characterized in that: satisfy between the focal power absolute value φ a of the first mirror group and the absolute value φ of total system focal power:
0.7φ≤φa≤1.5φ。
4, wide-angle pinhole television lens according to claim 1 is characterized in that: described entrance pupil is located at the front end of a camera lens cap assembly, and described first, second and third mirror group is located in the camera lens main body.
5, wide-angle pinhole television lens according to claim 4 is characterized in that: the camera lens cap assembly is provided with locking wheel, and locking wheel is that screw pair is connected with the camera lens cap assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021239584A CN1181373C (en) | 2002-07-10 | 2002-07-10 | Wide-angle pinhole television lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021239584A CN1181373C (en) | 2002-07-10 | 2002-07-10 | Wide-angle pinhole television lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1467525A CN1467525A (en) | 2004-01-14 |
| CN1181373C true CN1181373C (en) | 2004-12-22 |
Family
ID=34142569
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021239584A Expired - Fee Related CN1181373C (en) | 2002-07-10 | 2002-07-10 | Wide-angle pinhole television lens |
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| Country | Link |
|---|---|
| CN (1) | CN1181373C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0618671D0 (en) * | 2006-09-22 | 2006-11-01 | Secr Defence | Lens arrangement |
-
2002
- 2002-07-10 CN CNB021239584A patent/CN1181373C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1467525A (en) | 2004-01-14 |
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Effective date of registration: 20081212 Address after: No. 1 South gymnasium, capital gymnasium, Beijing, China: 100044 Co-patentee after: Beijing Vimicro Co., Ltd. Patentee after: The first Research Institute of the Ministry of public security Address before: No. 1 South gymnasium, capital gymnasium, Beijing, China: 100044 Patentee before: The First Research Institute of Ministry of Public Security |
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