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Specifications for viewer design

Use the Google Cardboard open-source specifications in this Help Center to create your own Cardboard-inspired viewer. The sections below explain the various specs and product tolerances for each part of the Cardboard viewer.

For easier distribution within manufacturing teams, you may also find it useful to download the full Cardboard Manufacturers Kit of specifications and tolerances.

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Lenses

Cardboard lenses enable the users to focus their vision on the smartphone screen and allows the smartphone to be placed at short focal distances (2-5 cm). They are critical to providing a great VR experience for users.

   

Lens design optical parameter specifications

 

Parameters Value Unit Comments
Designed FOV 80 ° Circular total field of view
Pupil diameter 15 mm Also known as the “eyebox”
Eye relief 18 mm From the designed eye pupil to lens surface vertex
Nominal virtual image distance -667 mm  
Lens diameter 34 mm  
Lens material PMMA   nd =1.492, v = 57.4
Mechanical body

The Google Cardboard mechanical body consists of three distinct parts: chassis, t-shirt, and button. Each of these parts is made from E-flute, 1.7mm thickness corrugated cardboard.

 

Sleeve specifications

Google Cardboard is delivered to users inserted into a kraft bending chip, 18 mil thickness sleeve, with the side flaps folder over.


Cardboard Sleeve

 

Oleophobic coating

The oleophobic coating should provide water and grease resistance. It should be skin safe and compliant with the food contact regulations. The coating should be applied on the user-facing part of viewer’s chassis. For best performance, it should be applied via a rod coater, not via flexo press.

Buttons

The button on a Google Cardboard viewer consists of two conductive parts (“pillow” and “strip”), glued to a cardboard-based “hammer”.

Cardboard button parts: (1) - "pillow", (2) - "hammer", (3) - "conductive strip

 

Conductive strip specifications

Parameters Value Unit
Material Metallized fabric (polyester Ni/Cu)  
Surface resistivity < 0.03 Ω/sq.
Z-axis resistance < 0.03 Ω

 

Conductive pillow specifications

Parameters Value Unit
Surface material Metallized fabric (polyester Ni/Cu)  
Core material Soft urethane foam  
Core surface resistivity < 0.07 Ω/sq.
PSA type Conductive  
PSA Z-axis resistance < 0.05 Ω
Velcro

Google Cardboard uses two round hook-and-loop velcros for the side flaps, and an oval hook-and-loop velcro for the top flap.

Hook-and-loop velcros as used in Google Cardboard: (1) - oval “loop” velcro, (2) - oval “hook” velcro, (3) - round “loop” velcro, (4) - round “hook” velcro

 

Oval velcro specifications

Parameters Value
Material Woven nylon
PSA type Acrylic-based adhesive
Color Black

 

Round velcro specifications

Parameters Value Tolerance Unit
Material Woven nylon    
Diameter 19.25 +/- 0.25 mm
PSA type Acrylic-based adhesive    
Color Black    
Rubber band

The back flap of a Google Cardboard contains a rubber band. The rubber band increases the friction between the phone’s bottom surface and the back flap, thereby reducing the chance of the phone’s slippage.

(1) - rubber band location on Google Cardboard

 

Rubber band specifications

Parameters Value Unit
Dimensions 76.2 x 6.35 x 1 mm
Artwork

Google Cardboard contains three printed pieces of artwork: an isometric viewer diagram placed on the sleeve, the isometric assembly instructions placed on the back flap of the chassis and the QR viewer profile placed on the chassis bottom.

Cardboard artwork placement: left - an isometric viewer diagram on the sleeve, center - the assembly instructions on the chassis, right - QR viewer profile.

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