TWI232325B - Fixed focus digital lens - Google Patents

Abstract

A fixed focus digital lens which positive optic power first lens, negative optic power second lens and positive optic power third lens are sequentially arranged in order from the objective to the image plane is introduced. The first lens is made by acrylic material. The second lens is made by polycarb material. The third lens is made by amorphous polyolefin optic transparent plastic material (ZEONEX). Accordingly, light attenuation at the camera lens surroundings is reduced to avoid generating the dark band. Through the utilization of different lens material, the temperature change of each lens is mutually balanced so the temperature change induced image quality degradation is reduced.

Description

1232325

[Technical field to which the invention belongs] The present invention is a fixed-focus digital lens $ lens device 'to increase the brightness of the lens around the lens, especially using the newly designed digits and reducing the sensitivity of temperature changes.] In view of the recent digital cameras, Pu has recently been used more compactly in mobile phones, digital assistants (and lightweight design), so it meets the commitment to design a small size, X3 port to meet the needs of the future market. Press, please refer to page-1¾, To have two lenses, it is the lens F2 from the object side to the lens 10a and the first optical power. The first lens is made of amorphous material, the second lens is made of 5, and the two lenses are composed of F2. ^ It is used everywhere in daily life, especially on small image capture devices, such as pp DA), in order to create human needs, so engineers have good and cheap lenses in order to learn Digital camera lens device, whose image plane is sequentially the first with positive optical capability Polyalkylene smoke optics optically clear plastic (ZEONEX) a square lens 2 is composed of acrylic (Aery 1 ic) Material Characteristics head manufactured as follows:

F2 / 4 0,940 F1 ~ ^ 〇169

Page 5 1232325

F 2 is the effective focal length; f 4 is the focal length of the first lens; f 5 is the focal length of the lens; I 2 is the maximum image height; Nd is the refractive index of the lens ^ two lenses Abbe number plane c editing) curvature Radius R (mm) Plane interval f mm) H d / Vd 11a 1. 1 87773 1.156 1.51512 / 57. 15 12a 1. 67 2 (54 0.542 21a -5 (5. 80634 0.875 1.50176 / 5 7.44 22a -9.87 17 55 0.104

Aspher i ca1 Conic: Coe f f on r Coe f f on r Coe f f on r Coe f f on r

Surface 12a: 2. 987802 4: 0.110177 6: -0.793024 8: 3.178125 10: -4 037481

Aspherical Surface 21a: Conic: -2508497

Coe f f on r 4: -0. 160239

Coe f f on r 6: 0. 1 6 4 6 3 2

1232325

V. Description of the invention (3)

Coeff on r 8: -0. 3 7 0 8 1 5 6 1

Coe f f on r 10: 0, 2 5 3 73 6 1 2

Surface

Aspher i ca1 Conic:

Coe ff on r 4: Coe ff on r 6: Coe ff on r 8: Coe ff on r 10: 2 2 a: -1359. 255 -0. 090137 0 · 0058453443 0.0013537382 -0. 00731 and see the first A Figures to the first G-graph 'are characteristic diagrams of conventional lenses. However, the above-mentioned conventional lens still has the following disadvantages: When light is imaged on the imaging surface through the lens lens, the brightness of the lens around the lens is significantly reduced compared to the overall brightness, which is caused by the obvious attenuation of the amount of light around the lens. In addition, the materials of the two lenses are used together, and they cannot balance each other's influence on the pan degree change, so as to affect the imaging quality. The reason is that the inventor based on this lack and based on years of relevant experience in manufacturing products, carefully observed and researched it, and devoted himself to studying and cooperating with the application of science, to propose a present invention with a reasonable design and effective improvement of the above-mentioned deficiency. SUMMARY OF THE INVENTION One of the objectives of the present invention is to provide a fixed-focus digital lens.

Page 7 ~ Fixed-focus digital lens, including the second lens 20 with positive light power, positive optical focus, and optical lens, and reducing the lens circumference 1232325 V. Description of the invention (4) The first lens with positive optical power, the second lens with negative optical power The third lens with positive optical capability is set to reduce the angle of light incident through the lens to the imaging plane, thereby solving the problem of rapid attenuation of the amount of light around the lens. Another object of the present invention is to provide a fixed-focus digital lens. Each of the first lens, the second lens, and the third lens is an acrylic material, a stainless steel material, and an amorphous polyolefin. Optically transparent plastic (^ 717 train 1 ^ said creation, so the materials are matched to balance their temperature changes == the overall image variation due to temperature of the lens, so it can maintain imaging quality. Another object of the present invention is to provide a fixed The focal digital lens enables the lenses to be manufactured by injection molding, so it has the advantages of small size, rapid prototyping, short fabrication, and reduced price. According to the aforementioned object of the invention, the present invention is a fixed focal digital lens, The image plane includes the first lens with positive optical power and the second lens with negative optical power in order; positive light! The third lens with power, i the first-lens system is Ϊ g: two or non-the first-lens system polycarw quality system And three times optically transparent plastic knee ⑽ title) made of material, and the crime of the first lens is 5.3 mm, so the total length of the lens to the imaging side due to temperature changes is less than the door 〇 士 # 丨 、 私π 闽 圄 々 ^ Said & This reduces the quality of the image and reduces the amount of light around the lens to prevent dark bands from occurring. [Embodiment] Please refer to the second figure, which is a short lens composed of the first lens 1 0 with academic ability and the second lens 30 with negative optical ability.

page

1232325 V. Description of the invention (6) The conventional short-focus lens does not cause the phenomenon of high optical path difference, which affects the imaging quality of the lens and reduces the dark band (V ige η tti ng) caused by the peripheral shading effect on the imaging surface. )phenomenon. Therefore, the fixed-focus digital lens of the present invention focuses the object space light onto the imaging plane of the light sensor 40, and converts the optical signal into an electronic signal by the light sensor 40, and the three lenses constitute The lens characteristics are as follows: F1 — = 1.795 / 1

Fi fi

— = 0.786 — = 0.051 — = 0.157 / 1; / 2; / 3 1.49 < N d <1.59; and 29 < V d < 58 FI is the effective focal length; il is the focal length of the first lens; f2 is the first Two lens focal lengths; f 3 is the third lens focal length; I 1 is the maximum image height; N d is the refractive index of the lens; Vd is the Abbe number of the lens

Surface (number) Curvature radius R (mm) Surface interval (mm) Nd / Vd 11 1.299232 0. 963109 1.50176 / 57.44 12 1.821011 0.248195 21 2. 1 2 2 7 3 1 0. 675322 1.57156 / 29.91 22 1.812535 0. 642917 31 5.226811 1.46537 1. 51512/57. 15 32 7.219328 0.251163

Page 10, 1232325 V. Description of the invention (7) Aspherical Surface 11: Conic: 0 • 3735142 Coe ff on r 4:-0. 029144862 Coe ff on r 6: 0. 0039218234 Coe ff on r 8:-0. 0082328557 Coe ff on r 10:-0. 019440625 Aspherical sur face 12: Conic: 3 • 065972 Coe ff on r 4: — 0. 08818095 Coe ff on r 6:-0. 0017445907 Coe ff on r 8: 0 .02090908 Coe ff on r 10: one 0.086345616 Aspherical Surface 21: Conic: 1.501935 Coe ff on r 4: 0 • 11218646 Coe ff on r 6: 0 .0039459153 Coe ff on r 8: 0 .0153102 Coe ff on r 10: 0. 079781346 Asrpher i cal Surface 22: Conic: — 1.213018

Page 11

1232325 V. Description of the invention (8)

Coe f f on r 4: Coe f f on r 6: Coe f f on r 8: Coef fonr 1 0: -0. 035867 -0. 00030537106 -0.010148304 0. 0051989105

Asrpher i ca1 Surface 31

Conic: Coe f f on r ^ Coe f f on r (Coe f f on r ^ Coe f f on r 10: -40-03911 -0.019126 -0. 000522019 0. 00018152707 0.0001143012

Aspherical Surface 32:

Lome: Coe ff on r ^ Coe ff on r (Coe ff on rl Coe ff on r 10: 1.427486 -0. 029121111 -0. 0029079381 -0,000133563 6. 549131e-006 A picture to the second G picture are lenses According to the characteristic diagram, it is known that the fixed-focus digital lens is suitable for small and lightweight digital camera lenses, such as those used in digital camera personal computer video cameras, PDAs, mobile phones, etc. Compare the second E diagram of the present invention with the conventional one The first E picture shows that when the lens is in a field of view of 0.5 to 1.0, the attenuation of the lens brightness of the present invention is less than conventional, and the second G picture and the conventional first G picture are compared. When the best focal plane is in the same range, we know that

Page 12 1232325 V. Description of the invention (9)

The depth is wider than conventional and has higher imaging quality, because of TF), wide ;;; bit lens has the advantages of high resolution and good spatial frequency (M sum up, low distortion, low shell attenuation distortion, etc.). Lens and stomach light "Li Jiao $: Lens" is the first set of positive optical power to reduce the attenuation of the light intensity of the second lens and the third lens of positive optical power. The lens peripheries are made of acrylic chairs, and the first, second, and third lenses are made of plastic (ZEONEX). Therefore, the optical quality is reduced due to the temperature-transparent plastic, which can maintain imaging quality. The side is based on the advantages of rapid prototyping, short production, and reduced price. Therefore, the f 达到 described above is only the preferred invention of the present invention, and each patent scope of the present invention is limited. The equivalent structural changes that are not constrained by this content include the description and the description, and are given to Chen Ming. 3; The scope of the present invention

Page 1312325 The diagram briefly illustrates that the first D diagram is the distortion of the imaging surface of the lens of the present invention (DistortiOn) Figure 1E diagram of the lens imaging surface of the present invention (re 1 afive illumination) The second F diagram is a Polychromatic di ffraction MTF diagram of the lens imaging surface of the present invention. The second G diagram is a Polychromatic diffraction through focus MTF diagram of the lens imaging surface of the present invention. [Reference number in the figure. ] Known positive optical power of the first lens 1 0 a first side of the first lens 1 1 a second side of the first lens 12 a positive optical power of the second side 2 0 a first side of the second lens 2 1 a Second side of two lenses 2 2 a Light sensing element 3 0 a First lens of positive optical power 1 according to the present invention 10 First side of first lens 1 1 Second side of first lens 1 2 Second lens of negative optical power 2 0 First side of the second lens 2 1 Second side of the second lens 2 2 Positive optical power third lens 3 0 First side of the second lens 3 1 First side of the second lens 3 2 Photosensitive element 4 0

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Claims (1)

Negative optical power The mirror system is made of acrylic and made of this third material. The first side and the third lens of the fixed-focus digital positive optical power are complementary to the metal pickup 1 and the third lens, and the first lens is a polycarb material. Made of optically transparent plastic (ZE0NEX) 2 · As close to the object of the first lens 3 in the patent application as described in the digital image 1-fixed focus digital lens 4 as in the patent application, where the photosensitive element is 3ππη。 The second lens and positive optical power material, the second transparent lens is an amorphous polyolefin described fixed-focus digital lens, the image plane distance is less than 5. 3ππη. Includes elements such as patent applications. Said digital image pickup unit is a semiconductor. Page 16