Projection lens, and projection display and rear projection display using this projection lens
A technology of projection lens and display device, applied in the field of projection lens, can solve the problems of increased waste, inability to rationalize, and reduced aberration performance of projection lens, and achieve the effect of good aberration performance
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reference example 1
[0109] Figure 5 It is an installation diagram showing the structure of the projection lens in Reference Example 1.
[0110] Such as Figure 5 As shown, the projection lens 13 in this reference example is composed of the following parts arranged in order from the screen 4 side to the image plane 5 side: the first lens group G1 of negative magnification, which consists of two lenses L1 as the front lens group , L2 composition; the second lens group G2 of positive magnification, which is composed of four lenses L3, L4, L5, L6 as the rear lens group; the third lens group G3 of positive magnification, which is similarly composed of the rear lens The group consists of six lenses L7, L8, L9, L10, L11, and L12; and a fourth lens group G4 of positive magnification, which is composed of a single lens L13 as an auxiliary lens group.
[0111] In addition, an aperture 14 is provided between the second lens group G2 and the third lens group G3.
[0112] In the projection lens 13 of this refer...
reference example 2
[0145] Figure 7 It is an installation diagram showing the structure of the projection lens in Reference Example 2. The projection lens 15 of this reference example is the same as the projection lens 13 of the reference example 1 in terms of the basic structure from the first lens group G1 to the fourth lens group G4 and the positional relationship between the optical axis 7 and the image plane 5.
[0146] The difference between the projection lens 15 of this reference example and the projection lens 13 of the reference example 1 is that the first projection lens group G1, the second projection lens group G2, the third projection lens group G3, and the fourth projection lens group G4 Parameters such as lens magnification distribution and surface spacing.
[0147] Represented in Table 3 below Figure 7 Specific numerical examples of each lens of the projection lens 15 are shown.
[0148] Lens
Side i
ri
di
ni
vi
L1
L2
L3
L4
L5 ...
reference example 3
[0160] Picture 9 It is an installation diagram showing the structure of the projection lens in Reference Example 3. The projection lens 16 of this reference example is the same as the projection lens 13 of the reference example 1 in terms of the basic structure from the first projection lens group G1 to the fourth lens group G4 and the positional relationship between the optical axis 7 and the image plane 5.
[0161] The difference between the projection lens 16 of this reference example and the projection lens 13 of the above-mentioned reference example 1 is the magnification distribution of the lenses constituting the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4, And parameters such as surface interval.
[0162] Shown in Table 5 below Picture 9 Specific numerical examples of each lens of the projection lens 16 are shown.
[0163] Lens
Side i
ri
di
m
vi
L1
L2
L3
L4 ...
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