CN204302586U - A kind of auxiliary lighting apparatus for measuring instrument - Google Patents

Abstract

The utility model discloses a kind of auxiliary lighting apparatus for measuring instrument, comprise light source, the first illumination group, scattering object, the second illumination group, by ray cast direction, light source, the first illumination group, scattering object, the second illumination group are laid successively, the light of light source outgoing throws light on scattering object through the first illumination group adjustment homogenizer, light therethrough scattering object also projects to the second illumination group after its scattering, and the second illumination group adjusts the projection of backward object to light beam.The advantage of technical solutions of the utility model is: realizing object Uniform Illumination while, light is allowed to be full of and the diaphragm that thrown light on equably, can while the uniformity image obtained, make the modulation transfer function of imaging contrast from low to high excessive continuously, make measurement camera lens can obtain object information to greatest extent.

Description

A kind of auxiliary lighting apparatus for measuring instrument

Technical field

The utility model belongs to measuring instrument auxiliary equipment manufacturing technology field, is specifically related to a kind of auxiliary lighting apparatus for measuring instrument.

Background technology

Fig. 1, Fig. 2 respectively show a kind of auxiliary lighting apparatus of measuring instrument conventional in the market.

See Fig. 1, it is critical illumination, and the light transmission illumination group 2 ' that namely light source 1 ' sends focuses on object 5 ', impinges upon on CMOS/CCD 8 ' by measuring imaging lens 6 '.Moved towards to find out by light, although diaphragm 7 ' is uniformly lighted, object space is the picture of light source, and the light-emitting area of Ordinary Light Sources Have is all very uneven, so object is very unevenly illuminated, weak effect.

See Fig. 2, it is the most frequently used Kohler illumination, and the light that namely light source sends focuses on diaphragm 7 ' by illumination group, and object is between illumination group and diaphragm, visible oBject can by Uniform Illumination in good condition, and diaphragm also can be filled by adjustment and realize limiting resolution.But, due to diaphragm and light source conjugation, and Ordinary Light Sources Have light-emitting area is all very uneven, so the illumination on diaphragm is also very uneven, the object of detector lens 6 ' is excessively discontinuous to the modulation transfer function contrast from low to high of the imaging on CMOS/CCD 8 ', cannot realize measuring capture requirement in good condition.

Summary of the invention

For solving the problems referred to above that prior art exists, the utility model discloses a kind of auxiliary lighting apparatus for measuring instrument.

The utility model takes following technical scheme: a kind of auxiliary lighting apparatus for measuring instrument, comprise light source, the first illumination group, scattering object, the second illumination group, by ray cast direction, light source, the first illumination group, scattering object, the second illumination group are laid successively, the light of light source outgoing throws light on scattering object through the first illumination group adjustment homogenizer, light therethrough scattering object also projects to the second illumination group after its scattering, and the second illumination group adjusts the projection of backward object to light beam.

Preferably, after object, lay camera lens, diaphragm, CMOS or CCD, diaphragm be in camera lens inside, after or before, last object picture be incident upon on CMOS or CCD.

Preferably, lay half-reflecting half mirror after the second illumination group, the side of half-reflecting half mirror is described object, and opposite side lays camera lens and CMOS/CCD successively, and object and CMOS/CCD are similar to conjugation by camera lens; Second illumination group adjustment after light beam projected to object by half-reflecting half mirror, object by after light reflection again through half-reflecting half mirror, camera lens and diaphragm, project on CMOS or CCD.

Light source selects bulb, LED, laser instrument or gas-discharge lamp.

Light source is secondary color light source or monochromatic source.

Preferably, the first illumination group and/or the second illumination group select set of lenses, and set of lenses is made up of one or more lens.

Preferably, scattering object is printing opacity and directional light transmission can be scattering into the optics of certain angle.

Preferably, scattering object is frosted glass, surface can the device of scattering voluntarily with the light-permeable glass of compound eye or plastics, opalescent plastic, surface texturing plastics, diffraction plate or material internal.

Preferably, camera lens be a kind of can in out of focus situation or focusing when the camera lens that measure object, or a kind of only can to the camera lens that object is measured in focusing situation.

The utility model principle is as follows: when object be minute surface or printing opacity object time, illumination enters camera lens through when can be changed opticpath after object hardly, light source by the back lighting of illuminating lens group on object, the light (coming from light source) of outgoing on object impinges upon CMOS/CCD by camera lens, object and CMOS/CCD are conjugation for measurement imaging lens, the picture of object can be incident upon on CMOS/CCD, CMOS/CCD is digital sensitive chip, can obtain project its surface picture and carry out storing or processing.

The advantage of technical solutions of the utility model is: realizing object Uniform Illumination while, light is allowed to be full of and the diaphragm that thrown light on equably, can while the uniformity image obtained, make the modulation transfer function of imaging contrast from low to high excessive continuously, make measurement camera lens can obtain object information to greatest extent.

Accompanying drawing explanation

Fig. 1 is the structural representation of prior art critical illumination.

Fig. 2 is the structural representation of prior art Kohler illumination.

Fig. 3 is the structural representation of embodiment 1.

Fig. 4 is the structural representation of embodiment 2.

Fig. 5 is the structural representation of embodiment 3.

Fig. 6 is the object-image relation schematic diagram measuring camera lens.

Detailed description of the invention

Below in conjunction with accompanying drawing, the utility model preferred embodiment is elaborated.

Embodiment 1

See Fig. 3, the auxiliary lighting apparatus that the present embodiment is used for measuring instrument comprises light source 1, illumination group 2, scattering object 3, illumination group 4, camera lens 6, diaphragm 7, CMOS/CCD 8 etc., by ray cast direction, light source 1, illumination group 2, scattering object 3, illumination group 4, object 5, camera lens 6, diaphragm 7, CMOS/CCD 8 sort setting successively.

Wherein, light source 1 can select bulb, LED, laser instrument, gas-discharge lamp or other light sources, and it can be secondary color light source, also can monochromatic source.

Illumination group 2 selects set of lenses, and it can change the running orbit of light source emergent light, makes it shine at a certain angle on scattering object.

Scattering object 3 can be frosted glass, the light-permeable of opalescent plastic or other any materials and directional light can be scattering into the optics of certain angle.

Illumination group 4 is set of lenses, its can using scattering object near the surface of illumination group 4 as light source, projected and measured near camera lens diaphragm, and realized the Uniform Illumination to object simultaneously.

Measure camera lens 6 pairs of picture elements require strict and can measure object when out of focus or focusing.

See Fig. 6, the figure illustrates the object-image relation measuring camera lens, the light that on object, A point sends converges to the D point of image space by camera lens B, retrains rising angle by diaphragm C.If when not having aberration, diffraction determines image quality, and diffraction is determined by diaphragm itself, and the size of diaphragm determines the resolution ratio of imaging, and the uniformity that diaphragm throws light on determines the imaging continuity that resolution ratio is excessive from low to high.Measuring camera lens picture element requires higher, so illumination is except to except object Uniform Illumination, also will realizing the Uniform Illumination on diaphragm.

The light of light source 1 outgoing throws light on scattering object 3 through illumination group 2 with adjusting homogenizer, and the light of scattering object transmissive portion is by scattering preferably, and allowing scattering object itself become can the secondary souce of uniformly light-emitting.The light that scattering object sends adjusts light beam through illumination group 4 and focuses on the diaphragm 7 measuring camera lens inside, and diaphragm just becomes the image space of this uniform secondary light source of scattering object, achieves and throws light on equably.And the light of this secondary souce of scattering object luminescence itself is before illumination group 4 converges to diaphragm, first through object 5, material is thus formed typical Kohler illumination structure, object has also been implemented and has thrown light on equably.

Embodiment 2

See Fig. 4, the difference of the present embodiment and embodiment 1 is: the present embodiment diaphragm 7 is positioned at the rear of camera lens 6.

Other content of the present embodiment can reference example 1.

Embodiment 3

See Fig. 5, in the present embodiment, by the projecting direction of light, lay light source 1, first illumination group 2, light transmission scattering material 3, second illumination group 4, half-reflecting half mirror 9 successively, the side of half-reflecting half mirror 9 is object 5, and opposite side lays camera lens 6 and CMOS/CCD 8 successively.Object 5 and CMOS/CCD 8 are similar to conjugation by camera lens 6.Light sends from light source 1, gather on light transmission scattering material 3 by the first illumination group 2, light is projected by illumination group 4 after scattering again and half-reflecting half mirror 9 reflexes on object 5, and object 5 enters camera lens 6 after light is transmitted back through half-reflecting half mirror 9, then enters CMOS/CCD 8.

Illumination group 2, illumination group 4 can be made up of one or more pieces eyeglasses separately, and lens materials can adopt and use glass or the plastics of light-permeable under spectrum.

Half-reflecting half mirror 9 can be dull and stereotyped, and also can be cemented prism, semi-reflective mirror face be 30-60 degree, preferably 45 degree.

Scattering object 3 can adopt surface can the device of scattering voluntarily with the light-permeable glass of compound eye or plastics, surface texturing plastics, diffraction plate or material internal with the frosted glass of micro-structural, surface.

Above preferred embodiment of the present utility model is described in detail; for those of ordinary skill in the art; according to the thought that the utility model provides, detailed description of the invention will change, and these changes also should be considered as protection domain of the present utility model.

Claims (9)

1. the auxiliary lighting apparatus for measuring instrument, it is characterized in that comprising light source, the first illumination group, scattering object, the second illumination group, by ray cast direction, light source, the first illumination group, scattering object, the second illumination group are laid successively, the light of light source outgoing throws light on scattering object through the first illumination group adjustment homogenizer, light therethrough scattering object also projects to the second illumination group after its scattering, and the second illumination group adjusts the projection of backward object to light beam.

2. as claimed in claim 1 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: after described object, lay camera lens, diaphragm, CMOS or CCD, diaphragm be in camera lens inside, after or before, last object picture be incident upon on CMOS or CCD.

3. as claimed in claim 1 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: after the second described illumination group, lay half-reflecting half mirror, the side of half-reflecting half mirror is described object, and opposite side lays camera lens and CMOS/CCD successively, and object and CMOS/CCD are similar to conjugation by camera lens; Second illumination group adjustment after light beam projected to object by half-reflecting half mirror, object by after light reflection again through half-reflecting half mirror, camera lens and diaphragm, project on CMOS or CCD.

4. as described in any one of claim 1-3 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: described light source selects bulb, LED, laser instrument or gas-discharge lamp.

5. as described in any one of claim 1-3 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: described light source is secondary color light source or monochromatic source.

6. as described in any one of claim 1-3 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: the first described illumination group and/or the second illumination group select set of lenses, and set of lenses is made up of one or more lens.

7. as described in any one of claim 1-3 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: described scattering object is printing opacity and directional light transmission can be scattering into the optics of certain angle.

8. as described in any one of claim 1-3 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: described scattering object is frosted glass, surface can the device of scattering voluntarily with the light-permeable glass of compound eye or plastics, opalescent plastic, surface texturing plastics, diffraction plate or material internal.

9. as described in Claims 2 or 3 for the auxiliary lighting apparatus of measuring instrument, it is characterized in that: described camera lens be a kind of can in out of focus situation or focusing when the camera lens that measure object, or a kind of only can to the camera lens that object is measured in focusing situation.