9results about How to "Wide angle" patented technology

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens, which comprises five lenses, the five lenses are sequentially a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power from the object side to the image side; wherein the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, the curvature radius of the object side surface of the third lens is R5, and the curvature radius of the image side surface of the third lens is R6, the following relational expressions are satisfied:-1.00 < = f3 / (R5 + R6) < =-0.30; -0.65 < = (R1 + R2) / (R1-R2) < =-0.25; f1 / f2 is greater than or equal to-8.00 and less than or equal to-4.00.

A portable wave-shaped guardrail installation device comprises a limiting mechanism, the limiting mechanism comprises a set of frames, a set of wave-shaped limiting baffles are installed between the two frames, the set of frames and the wave-shaped limiting baffles are combined to form a guardrail limiting area, one end of the limiting mechanism and a connecting mechanism are installed and fixed together, and the other end of the limiting mechanism is connected with the connecting mechanism. The other end of the connecting mechanism and the hydraulic mechanism are fixedly mounted together; according to the device, the wave-shaped guardrail is positioned through the arrangement of the V-shaped frame and the wave-shaped limiting baffles, up-down and left-right movement of the wave-shaped guardrail is effectively prevented, meanwhile, the wave-shaped limiting baffles are made of rubber materials, damage to the guardrail caused by hard contact with the guardrail is avoided, meanwhile, the device is attached to the guardrail more tightly, and the service life of the guardrail is prolonged. Slippage and rebounding caused by hard action between the guardrail and the device are avoided; long waist-shaped grooves are formed in the two sides of the connecting block, so that the limiting mechanism can be adjusted according to the mounting height of the wave-shaped guardrail; the device overcomes the defects in the prior art, mechanical installation of the wave-shaped guardrail is achieved, and the device is convenient to carry.

This invention provides a camera optical lens, comprising, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has negative refractive power. The field of view (FOV) of the camera optical lens is , the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, the axial distance from the image side of the second lens to the object side of the third lens is d4, and the axial distance from the image side of the third lens to the object side of the fourth lens is d6, satisfying the following relationships: 100.00°≤FOV≤135.00°; -5.00≤f6 / f7≤-1.00; 0.85≤d4 / d6≤5.00. This camera optical lens not only possesses excellent optical performance but also meets the design requirements of a large aperture and wide angle.

The utility model relates to a prime lens, which sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with negative focal power along an optical axis from an object side to an image side, totally six lenses, the image side surface of the first lens is a concave surface; the second lens is a convex lens; the third lens is a concave-convex lens; the image side surface of the fourth lens is a convex surface; the fifth lens is a convex-convex lens; the sixth lens is a concave-convex lens; the effective focal length F1 of the first lens and the effective focal length F of the prime lens meet the following relation: F1 / F is more than or equal to-1.58 and less than or equal to-1.40; the effective focal length F3 of the third lens and the effective focal length F of the prime lens meet the following relation:-7.36 < = F3 / F < =-5.14. The prime lens of the utility model has at least one of the characteristics of high resolution, low cost, small volume, day and night use and the like.

This invention relates to the field of optical lenses, and discloses a camera optical lens comprising seven lenses, arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power; wherein the focal length of the camera optical lens is f, the focal length of the first lens is f1, the central radius of curvature of the object side of the fifth lens is R9, the central radius of curvature of the image side of the fifth lens is R10, the axial thickness of the fourth lens is d7, and the axial distance from the image side of the fourth lens to the object side of the fifth lens is d8, and satisfies the following relationships: 1.00≤f1 / f≤2.00; 5.00≤d7 / d8≤10.00; 2.00≤R9 / R10≤8.00. This camera lens not only boasts excellent optical performance but also meets the design requirements of large aperture, wide-angle, and ultra-thin design.

This utility model relates to the field of mechanical equipment. The technical solution of this utility model is as follows: a sand dressing device with a wall-mounted grinding wheel bracket, comprising a base, characterized in that: a grinding wheel is provided on the base, and a dressing mechanism is also provided at the front end of the base. The dressing mechanism includes a dressing track fixed to the front side of the base, a movable block is slidably arranged on the dressing track, a connecting rod is rotatably arranged on the movable block, a fixed rod is connected to the upper end of the connecting rod, and a dressing head is provided on the fixed rod; the dressing head includes a mounting plate, a screw is provided inside the mounting plate, a handle is also provided at one end of the screw, a fixed block is slidably arranged on the screw, and a diamond pen is also provided on the fixed block.

Embodiments of this application relating to the field of photo-taking technologies, and provide a shooting method and an electronic device, to synchronously increase or decrease an exposure for capturing images by a plurality of camera lenses when the plurality of camera lenses are used to perform shooting. The method is applied to an electronic device including a first camera lens and a second camera lens. The electronic device displays a first interface. The first interface includes a first image captured by the first camera lens and a second image captured by the second camera lens. The electronic device displays a second interface in response to the first operation performed on the second image. The second interface includes a third image captured by the first camera lens and a fourth image captured by the second camera lens. An exposure of the third image is higher than an exposure of the first image, and an exposure of the fourth image is higher than an exposure of the second image. Alternatively, an exposure of the third image is lower than an exposure of the second image, and an exposure of the fourth image is lower than the exposure of the second image.

This invention relates to the field of optical lenses and discloses a camera optical lens comprising seven lenses, arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with negative refractive power; wherein the focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, the axial thickness of the third lens is d5, and the axial distance from the image side of the third lens to the object side of the fourth lens is d6, and satisfies the following relationships: -10.00≤f4 / f≤10.00; 4.00≤d5 / d6≤8.00; 2.00≤(R3+R4) / (R3-R4)≤10.00. This camera lens not only boasts excellent optical performance but also meets the design requirements of large aperture, wide-angle, and ultra-thin design.

This invention relates to the field of optical lenses and discloses a camera optical lens comprising seven lenses, arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with negative refractive power; wherein the focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, the axial thickness of the first lens is d1, and the axial distance from the image side of the first lens to the object side of the second lens is d2, satisfying the following relationships: -10.00≤f4 / f≤10.00; 1.00≤d1 / d2≤3.00; 2.00≤(R3+R4) / (R3-R4)≤7.00. This camera lens not only boasts excellent optical performance but also meets the design requirements of large aperture, wide-angle, and ultra-thin design.