CN100543516C - The optical prism group - Google Patents
The optical prism group Download PDFInfo
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- CN100543516C CN100543516C CNB2004100699633A CN200410069963A CN100543516C CN 100543516 C CN100543516 C CN 100543516C CN B2004100699633 A CNB2004100699633 A CN B2004100699633A CN 200410069963 A CN200410069963 A CN 200410069963A CN 100543516 C CN100543516 C CN 100543516C
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- isosceles triangular
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Abstract
A kind of optical prism group comprises an isosceles triangular prism and a plurality of prism blocks.The base angle of one isosceles triangular prism is greater than 30 degree and less than 45 degree, and first and second prism blocks is respectively in abutting connection with the isometric two sides of this isosceles triangular prism.One prism block, be adjacent to this first and this second prism blocks between.This isosceles triangular prism and respectively two adjacent edge interfaces of this prism blocks form one first and one second double-colored optical filtering all respectively, make this isosceles triangular prism and first and second double-colored optical filtering continuous level of form intersecting in conjunction with the back of this prism blocks respectively.
Description
Technical field
The relevant a kind of optical prism group of the present invention, especially relevant a kind of digital light that is used for is handled (digital lightprocessing; DLP) the optical prism group of optical projection system.
Background technology
Please refer to Fig. 1, show the digital light processing optical projection system that United States Patent (USP) US is disclosed for 5,826, No. 959 with incident is red, blue and the synthetic X prism group (cross dichroic prism) that penetrates of green trichromatic coloured light.As shown in Figure 1, existing digital light is handled optical projection system and is comprised an X prism group (cross dichroicprism) 100, three polarization splitting prisms 102,104,106, and three spatial light modulation device (spatial lightmodulator; SLM) 108,110,112.By the process of X prism group 100 with spatial light modulation device 108,110,112 collocation generation images, each spatial light modulation device can be operated red (R), green (G), blue (B) wherein a kind of coloured light.Spatial light modulation device 108,110,112 is respectively three liquid crystal light valves 108,110,112,102,104,106 of polarization splitting prisms are situated between respectively and are located between liquid crystal light valve 108,110,112 and the X prism group 100, and double-colored optical filtering 120 and 122 arranged in a crossed manner can be distinguished only reflect blue and ruddiness in the X prism group, and makes other coloured light pass through.Therefore, when ruddiness, green glow and blue light respectively via polarization splitting prism 102,104,106, after liquid crystal light valve 108,110,112 reflection, X prism group 100 can be with ruddiness, green glow and the blue light combination and the vertical outgoing of same direction of leading.
Yet the design of prior art has distinct disadvantage, promptly each coloured light be with a great incident angle (45 degree) oblique incidence to double-colored optical filtering 120 and 122.When the incident angle that is incident to double-colored optical filtering was excessive, the polarization spectrum by double-colored optical filtering can drift about and obviously reduce.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of utilization ratio that improves coloured light, close the colour purity behind the light and the optical prism group of brightness.
According to the present invention's design, a kind of optical prism group comprises an isosceles triangular prism and a plurality of prism blocks.This isosceles triangular prism has first and second isometric boundary surface, and the angle of first boundary surface and adjacent the 3rd boundary surface is restricted to greater than in 30 degree and the scopes less than 45 degree.A plurality of prism blocks comprise one first prism blocks, one first boundary surface is in abutting connection with first boundary surface of isosceles triangular prism, one second boundary surface adjacent with its first boundary surface and second boundary surface of isosceles triangular prism are located at same plane, and one the 3rd boundary surface forms the penetration surface of coloured light vertical incidence; One second prism blocks, one first boundary surface is in abutting connection with second boundary surface of isosceles triangular prism, one second boundary surface adjacent with its first boundary surface and first boundary surface of isosceles triangular prism are located at same plane, and one the 3rd boundary surface forms the penetration surface of coloured light vertical incidence; One prism block, one first boundary surface is in abutting connection with second boundary surface of first prism blocks, one second boundary surface adjacent with its first boundary surface is in abutting connection with second boundary surface of second prism blocks, and one the 3rd boundary surface forms the penetration surface of this coloured light vertical incidence.One first double-colored optical filtering is formed between first boundary surface of first boundary surface of isosceles triangular prism and first prism blocks continuously, and between second boundary surface of second boundary surface of second prism blocks and prism block.One second double-colored optical filtering is formed between first boundary surface of second boundary surface of isosceles triangular prism and second prism blocks continuously, and between first boundary surface of second boundary surface of first prism blocks and prism block.
According to design of the present invention, it uses an isosceles triangular prism to extend the double-colored optical filtering plane that design two intersects for the basis, again with the combination of corresponding prism blocks, can reach the easy prism array mode of utilization so on the one hand and can guarantee each coloured light light path unanimity and each coloured light can vertical incidence and the purpose of outgoing prism group in the optical prism group.
On the other hand, can adjust the angle on two double-colored optical filtering planes by the base angle size of control isosceles triangular prism, and then adjust the incident angle of coloured light on double-colored optical filtering.Therefore, the present invention is limited in the base angle β of isosceles triangular prism greater than in 30 degree and the scope less than 45 degree, and can dwindle the folded acute angle in two double-colored optical filtering planes, oblique incidence to the coloured light of double-colored optical filtering is incident on the double-colored optical filtering with less angle, and can avoid the polarization spectrum of double-colored optical filtering to drift about, significantly improve the light utilization ratio, its colour purity of image and the brightness of closing behind the light are greatly improved.
(4) description of drawings
Fig. 1 is a synoptic diagram, shows the existing digital light processing optical projection system that comprises X prism group.
Fig. 2 is according to one embodiment of the invention, shows the floor map of an optical prism group.
Fig. 3 is a synoptic diagram, closes with the connection of explanation its prism component of optical prism group of the present invention to be and angle configurations.
Fig. 4 is for showing the stereographic map of the three-dimensional kenel of prism component of the present invention.
Fig. 5 shows the synoptic diagram of optical prism combined light process of the present invention.
Fig. 6 is the ruddiness polarized light spectrogram of corresponding different incidence angles.
(5) embodiment
Fig. 2 is one embodiment of the invention, shows the floor map of an optical prism group 10.As shown in Figure 2, optical prism group 10 is used for digital light processing (digital light processing; DLP) optical projection system, after arranging in pairs or groups, can produce image with three digital optical processing panels (DLP panel) 34,36 and 38, digital light is handled on the panel 34,36 and 38 and is formed with a large amount of micro-reflectors, produce by control minute surface angle of inclination and to make light penetration optical projection system (bright attitude) or not penetrate two kinds of variations of optical projection system (dark attitude), three digital optical processing panels 34,36 and 38 are operated the wherein a kind of of red (R), green (G), blue (B) three kinds of coloured light respectively.
The following design that optical prism group 10 is described with reference to Fig. 3.As shown in Figure 3, optical prism group 10 of the present invention is by an isosceles triangular prism (isosceles triangular prism) 26 and prism blocks (prismblock) 28,30 and 32 formations.Prism blocks 28 and 30 can be made of quadrangular (quadrangular prism), and prism blocks 32 can be made of a pentagonal prism (pentagonal prism).
Fig. 4 is for showing the member stereographic map of above-mentioned isosceles triangular prism (a), quadrangular (b), with its three-dimensional kenel of prism component of explanation the present invention employing.As shown in Figure 4, " isosceles triangular prism " of the present invention is to be defined as the surface level that has pair of parallel and be made of isosceles triangle, reach three the vertical sides vertical and define the three-dimensional kenel that forms, so have the vertical side of two isometric L and identical base angle β with this surface level.In like manner in " quadrangular " kenel that occurs herein also be similarly surface level with pair of parallel and only the number of variations of vertical side be four, the rest may be inferred by analogy.Moreover light is the vertical side turnover via each prism, and for for the purpose of the cooperation plan view from above that icon adopted, the vertical side of each prism component is referred to as with " boundary surface (boundingsurface) " without exception.
Referring again to Fig. 3, the angle β that the present invention at first designs 26 two isometric boundary surface 26a of isosceles triangular prism and 26b and bottom surface 26c is restricted to greater than 30 degree and less than 45 scopes of spending, and for example can adopt 40 degree.One boundary surface 28a of prism blocks 28 is in abutting connection with the boundary surface 26a of isosceles triangular prism, and a boundary surface 28b adjacent with boundary surface 28a and the boundary surface 26b of isosceles triangular prism are located at same plane.
According to present embodiment, prism blocks 30 is identical shaped and big or small quadrangular with prism blocks 28, and also be connected to isosceles triangular prism 26 in the same manner, that is a boundary surface 30a of prism blocks 30 is in abutting connection with the boundary surface 26b of isosceles triangular prism, and the boundary surface 26a of adjacent boundary surface 30b and isosceles triangular prism is located at same plane.
Two boundary surface 32a and 32b of prism blocks 32 are respectively with the boundary surface 28b of prism blocks 28 and the boundary surface 30b adjacency of prism blocks 30.The boundary surface that prism blocks 28,30 and 32 is handled panel towards digital light all with this digital light treated side board plane keeping parallelism.
Under this prism combo architectures, between boundary surface 26a and 28a, and boundary surface 30b and boundary surface 32b between Jie establish the coating of a continuous level to form a double-colored optical filtering 22.Simultaneously, between boundary surface 26b and 30a, and boundary surface 28b and 32a between be situated between and establish the coating of another continuous level to form another double-colored optical filtering 24.Double-colored optical filtering the 22, the 24th produces by plating the interference thin film that can leach the specific color frequency band, and its generation type in the optical prism group does not limit, after for example two adjacent edge interfaces of isosceles triangular prism, first, second and third each prism component of prism blocks can being formed the interference thin film that leaches ruddiness and blue light respectively, again with each prism component with above-mentioned prism combo architectures combination, can form the double-colored optical filtering continuous level of two intersections.
Because of the angle of 26 two isometric boundary surface 26a of isosceles triangular prism and 26b and bottom surface 26c is β, so double-colored optical filtering 22 is 2 β with 24 liang of folded acute angles of continuous level of double-colored optical filtering, and the angular range of this acute angle be to spend greater than 60 degree and less than 90.
The following angle configurations example that optical prism group 10 of the present invention is described referring again to Fig. 2 and Fig. 3.Because of prism blocks of the present invention must configuration make digital light handle panel 34,36 and 38 light reflected, all vertically enter the boundary surface of prism group 10 as shown in Figure 2, and after the palpus configuration made prism group 10 close light, the light W after the combination must be by the vertical outgoing of isosceles triangular prism 26 bottom surface 26c.So as shown in Figure 3, when the ∠ ABO=β of the base angle of isosceles triangular prism 26, the folded acute angle ∠ of the two continuous levels BOD=2 β of double-colored optical filtering 22 and double-colored optical filtering 24, and when ∠ BCD is taken as preferable pi/2 in order to boundary surface and digital light treated side board plane keeping parallelism, then ∠ CBO=(π-3 β) and ∠ CDO=(π+β/2).
Fig. 5 shows the photoreduction process that closes of optical prism group 10 of the present invention.As illustrated in Fig. 5, through three digital optical processing panels handle and ruddiness (R), blue light (B) and the green glow (G) of reflection respectively by left side, right side and the downside vertical incidence of optical prism group 10 to prism blocks 28,30 and 32 and enter in the optical prism group 10.According to present embodiment, because of double-colored optical filtering 22 is to be designed to leach and reflect blue and transmit red light and green glow, double-colored optical filtering 24 can leach and reflect red and transmit green and blue light, so ruddiness (R) via prism blocks 28 1 boundary surface vertical incidence after, penetrable double-colored optical filtering 22 and on double-colored optical filtering 24 reflection again by the vertical outgoing of bottom surface 26c of isosceles triangular prism 26; Blue light (B) via prism blocks 30 1 boundary surface vertical incidence after, penetrable double-colored optical filtering 24 and on double-colored optical filtering 22 reflection again by the vertical outgoing of bottom surface 26c of isosceles triangular prism 26; Green glow (G) via prism blocks 32 1 boundary surface vertical incidence after, penetrate double-colored optical filtering 24 and double-colored optical filtering 22 simultaneously again by the vertical outgoing of bottom surface 26c of isosceles triangular prism 26.So optical prism group 10 is promptly finished the process of combine red (R), blue light (B) and green glow (G).
According to design of the present invention, it uses an isosceles triangular prism to extend the double-colored optical filtering plane that design two intersects for the basis, again with the combination of corresponding prism blocks, can reach the easy prism array mode of utilization so on the one hand and can guarantee each coloured light light path unanimity and each coloured light can vertical incidence and the purpose of outgoing prism group 10 in optical prism group 10.
On the other hand, can adjust the angle on two double-colored optical filtering planes by the base angle size of control isosceles triangular prism, and then adjust the incident angle of coloured light on double-colored optical filtering.Therefore, the present invention is limited in the base angle β of isosceles triangular prism greater than in 30 degree and the scope less than 45 degree, and can dwindle the folded acute angle in two double-colored optical filtering planes, oblique incidence to the coloured light of double-colored optical filtering is incident on the double-colored optical filtering with less angle, and can avoid the polarization spectrum of double-colored optical filtering to drift about, significantly improve the light utilization ratio, its colour purity of image and the brightness of closing behind the light are greatly improved.
Fig. 6 is example with ruddiness, shows via the ruddiness polarized light spectrogram after the double-colored optical filtering reflection, with the influence of explanation incident angle size to polarization spectrum.The top of Fig. 6 shows that existing design ruddiness is incident to the polarized light spectrogram of double-colored optical filtering with miter angle, and the below then be by the present invention's design, and the ruddiness incident angle is contracted to for example 40 polarized light spectrograms of spending.Compare both as can be known, when incident angle is changed to 45 of last figure and is spent by 40 degree of figure below, the spectral position of P polarized light is significantly to right-hand drift, and reflectivity significantly reduces, so greatly lower because of the colourity and the brightness that can make ruddiness that declines to a great extent of the utilization ratio of P polarized light, influence close color behind the light to saturation degree when.
Moreover as shown in Figure 5, each coloured light zone of transmission not can be coated with light absorbing material 42 on optical prism group 10 boundary surfaces, to absorb the parasitic light (stray light) in the optical prism group 10.
The above only is exemplary, but not is restricted.Any spirit of the present invention and category of not breaking away from, and to the modification or the change of its equivalence of carrying out, all should be contained in the accompanying Claim scope.
Claims (9)
1. optical prism group, in order to the multiple tracks coloured light that combination is handled through digital light, to form an emergent light, this optical prism group comprises:
One isosceles triangular prism (26) has greater than 30 degree and less than 45 base angles of spending;
One first prism blocks (28) is adjacent to a waist of this isosceles triangular prism (26);
One second prism blocks (30) is adjacent to another waist of this isosceles triangular prism (26); And
One prism block (32), be adjacent to this first (28) and this second prism blocks (30);
Wherein, the adjacent surface between this prism block (32) and this first prism blocks (28), and the adjacent surface between this isosceles triangular prism (26) and this second prism blocks (30) is positioned at same plane; Adjacent surface between this prism block (32) and second prism blocks (30), and the adjacent surface between this isosceles triangular prism (26) and this first prism blocks (28) is positioned at same plane;
One first optical filtering (22) is arranged between this first prism blocks (28) and this isosceles triangular prism (26), reaches between this prism block (32) and this second prism blocks (30); And
One second optical filtering (24) is arranged between this second prism blocks (30) and this isosceles triangular prism (26), reaches between this first prism blocks (28) and this prism block (32).
2. optical prism group as claimed in claim 1 is characterized in that each coloured light is incident to the angle of pairing optical filtering greater than 30 degree and less than 45 degree.
3. optical prism group as claimed in claim 1, it is characterized in that this first and this second optical filtering be respectively a double-colored optical filtering.
4. optical prism group as claimed in claim 1 is characterized in that also including one first digital light and handles the panel configured in parallel and handle the panel configured in parallel and towards this second prism blocks and one the 3rd digital light is handled the panel configured in parallel and towards this prism block towards this first prism blocks, one second digital light.
5. optical prism group as claimed in claim 1 is characterized in that this first prism blocks is identical with the shape and the size of this second prism blocks.
6. optical prism group as claimed in claim 1 is characterized in that this optical prism group also comprises a light absorbing material, and this light absorbing material is distributed on this optical prism group boundary surface the not zone of transmission of coloured light.
7. optical prism group as claimed in claim 1, it is characterized in that this multiple tracks coloured light comprises one first, second and third coloured light, this first optical filtering reflects this first coloured light and other coloured light of transmission, and this second optical filtering reflects this second coloured light and other coloured light of transmission.
8. optical prism group as claimed in claim 4, it is characterized in that being defined as β when the base angle of this isosceles triangular prism, its folded interior angle of two boundary surfaces in abutting connection with this isosceles triangular prism and this prism block of this first prism blocks is 2 β, and this first prism blocks its be π-3 β in abutting connection with this isosceles triangular prism and towards the folded interior angle of two boundary surfaces that this first digital light is handled panel.
9. optical prism group as claimed in claim 5, it is characterized in that being defined as β when the base angle of this isosceles triangular prism, its folded interior angle of two boundary surfaces in abutting connection with this isosceles triangular prism and this prism block of this second prism blocks is 2 β, and this second prism blocks its be π-3 β in abutting connection with this isosceles triangular prism and towards the folded interior angle of two boundary surfaces that this second digital light is handled panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100699633A CN100543516C (en) | 2004-07-16 | 2004-07-16 | The optical prism group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100699633A CN100543516C (en) | 2004-07-16 | 2004-07-16 | The optical prism group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1721914A CN1721914A (en) | 2006-01-18 |
| CN100543516C true CN100543516C (en) | 2009-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100699633A Expired - Fee Related CN100543516C (en) | 2004-07-16 | 2004-07-16 | The optical prism group |
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| Country | Link |
|---|---|
| CN (1) | CN100543516C (en) |
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- 2004-07-16 CN CNB2004100699633A patent/CN100543516C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1721914A (en) | 2006-01-18 |
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Granted publication date: 20090923 Termination date: 20210716 |