In 1961, Hazelting Corp. of the United States published Multiplanar, the pioneer of the first multi-layer board development. This multi-layer board method is almost the same as the current method of manufacturing multi-layer board by plated through hole method. After Japan entered this field in 1963, various ideas and manufacturing methods for multi-layer boards were gradually popularized around the world. As the era of computer-based integrated circuits has become more common, the application of computers has become more common. Due to the demand for high functionality, the large wiring capacity and good transmission characteristics have become the focus of multi-layer boards.

In recent years, with the advancement of VLSI and miniaturization of electronic components and high integration, multi-layer boards are moving in the direction of high-performance circuits, which is why there is a growing demand for high-density lines and high wiring capacity. The requirements for electrical characteristics (such as Crosstalk, integration of impedance characteristics) are more stringent. The popularity of multi-legged parts and surface-mount components (SMD) makes the circuit board pattern more complex, the conductor lines and apertures are smaller, and the development of high-layer boards (10-15 layers) is popular. . In the latter half of the 1980s, thin-layer multi-layer boards with a thickness of 0.4 to 0.6 mm were gradually popularized for high-density wiring and small holes in line with small and lightweight requirements. The hole guide and shape of the part are completed by punching. In addition, some of the products produced in small quantities and diversely use a photoreceptor to form a pattern.

High-power amplifier - Substrate: ceramic + FR-4 plate + copper base, number of layers: 4 layers + copper base, surface treatment: immersion gold, features: ceramic + FR-4 sheet mixed lamination, with copper-based pressure knot.

Military high-frequency multi-layer board - Substrate: PTFE, thickness: 3.85mm, number of layers: 4 layers, features: blind buried holes, silver paste hole filling.

Green product - Substrate: Environmentally friendly FR-4 sheet, thickness: 0.8mm, number of layers: 4 layers, size: 50mm × 203mm, line width / line spacing: 0.8mm, aperture: 0.3mm, surface treatment: immersion gold, Shen Xi. High frequency, high Tg device - Substrate: BT, number of layers: 4 layers, thickness: 1.0mm, surface treatment: gold.

Embedded System - Substrate: FR-4, number of layers: 8 layers, thickness: 1.6mm, surface treatment: spray tin, line width / line spacing: 4mils / 4mils, solder resist color: yellow.

DCDC, power module - Substrate: high Tg thick copper foil, FR-4 sheet, size: 58mm × 60mm, line width / line spacing: 0.15mm, aperture: 0.15mm, thickness: 1.6mm, number of layers: 10 layers , Surface treatment: immersion gold, features: each layer of copper foil thickness 3OZ (105um), blind buried hole technology, high current output.

High-frequency multilayer board - Substrate: ceramic, number of layers: 6 layers, thickness: 3.5mm, surface treatment: immersion gold, features: buried holes.

Photoelectric conversion module - Substrate: ceramic + FR-4, size: 15mm × 47mm, line width / line spacing: 0.3mm, aperture: 0.25mm, number of layers: 6 layers, thickness: 1.0mm, surface treatment: gold plating + Gold finger, features: embedded positioning.

Backsheet - Substrate: FR-4, number of layers: 20 layers, thickness: 6.0mm, outer copper thickness: 1/1 ounce (OZ), surface treatment: immersion gold.

Micro module - Substrate: FR-4, number of layers: 4 layers, thickness: 0.6mm, surface treatment: immersion gold, line width / line spacing: 4mils / 4mils, features: blind holes, semi-conductive holes.

Communication base station - Substrate: FR-4, number of layers: 8 layers, thickness: 2.0mm, surface treatment: spray tin, line width / line spacing: 4mils / 4mils, features: dark solder mask, multi-BGA impedance control.

Data Collector - Substrate: FR-4, number of layers: 8 layers, thickness: 1.6mm, surface treatment: immersion gold, line width / line spacing: 3mils / 3mils, solder mask color: green matte, features: BGA Impedance control.

Outdoor Bench

Outdoor bench refers to the seating facilities used in outdoor places, often commonly found in parks, squares, leisure areas, scenic spots and other outdoor environments. The classification of outdoor benches can be introduced according to many aspects such as material, shape and function.

First, classification by material
1. Wooden bench: Wooden bench is one of the most common outdoor benches, usually made of natural wood, with natural and environmentally friendly characteristics. Wooden benches are usually made of solid wood or artificial wood, and the surface is treated with waterproof and anti-corrosion, which can adapt to various climatic conditions in the outdoor environment.

2. Metal bench: Metal bench is made of metal materials, such as cast iron, steel, etc. The metal bench is durable, corrosion resistant, easy to clean and is suitable for all kinds of outdoor environments.

3. Stone bench: Stone bench is made of marble, granite and other stone, which has the characteristics of good texture and beautiful appearance. Stone benches are generally suitable for high-end places such as garden scenic spots and can be integrated with the surrounding environment.

5. Combined material bench: Combined material bench refers to the bench made of different materials, such as the combination of wood and metal, stone and plastic combination. Combined material bench can usually combine the advantages of different materials, more in line with the needs of different outdoor environments.

2. Classification by shape
1. Linear bench: Linear bench is the most common shape of bench, generally composed of a row of seats, forming a straight line arrangement. The linear bench is suitable for outdoor places with large pedestrian flow and can provide more seats.

2. Arc bench: Arc bench is an arc bench composed of multiple seats, usually used in a ring seat area or landscape area. The curved bench can not only provide comfortable seating, but also increase the aesthetics of the place.

3. Wavy bench: The wavy bench is a bench composed of multiple seats in the shape of undulating waves, giving people a sense of movement and flow. The wavy bench is suitable for parks, squares and other places that need to increase vitality and fun.

4. Round bench: A round bench is a round bench composed of a number of seats, which is usually used in outdoor recreation areas and can provide a place for groups to gather.

3. Classification by function
1. Leisure bench: Leisure bench is a common form of outdoor bench, it can provide comfortable seats, so that people can relax in the outdoor environment.

2. Viewing bench: Viewing bench is usually set in a scenic outdoor environment, providing comfortable seats for people to enjoy the scenery.

3. Sitting bench: Sitting bench is usually set in parks, squares and other places with large traffic, to provide people with a short rest and relaxation.

4. Cool pavilion bench: Pavilion bench refers to a form of combination of bench and pavilion, which can provide sunshade, rain prevention and other functions, suitable for outdoor leisure areas.

In short, the classification of outdoor benches can be divided from many aspects such as material, shape and function. Different outdoor environments and needs need to choose a suitable bench type to provide comfortable and beautiful seating facilities

Beach Bench,Deck Chair,Deck Bench,Waterproof Bench

Foshan Shengshi Zhihui Technology Co., Ltd. , https://www.officeroutdoorfurniture.com